Fetal Alcohol Syndrome: What Causes It, What to Look For, and How Early Help Changes Outcomes
Updated: 3 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 2026
Quick Answer: What is fetal alcohol syndrome?
Fetal alcohol syndrome is a condition in a child caused by alcohol exposure during pregnancy, at the severe end of fetal alcohol spectrum disorders. [3] Lifelong symptoms may include distinctive facial features, slow growth and learning and behavior challenges. [3] No amount of alcohol is known to be safe in pregnancy. [3] There is no cure, but early intervention helps. [4]
What the research says
Fetal alcohol spectrum disorder is common worldwide and largely preventable. A meta-analysis of 24 studies including 1,416 children and youth with FASD estimated a global prevalence of 7.7 per 1,000 in the general population (95% CI 4.9–11.7), highest in the WHO European Region (19.8 per 1,000), and described FASD as a largely preventable alcohol-related developmental disability (PubMed: Lange et al., JAMA Pediatr, 2017 [1]).
People with fetal alcohol syndrome often have many co-occurring conditions. A systematic review of 127 studies identified 428 comorbid conditions in people with FASD, spanning 18 of 22 ICD-10 chapters; among 1,728 people with FAS, the most prevalent conditions (pooled prevalence 50% to 91%) included abnormal peripheral nervous system and special-sense function studies, conduct disorder, receptive and expressive language disorders, and chronic serous otitis media (PubMed: Popova et al., Lancet, 2016 [2]).
What Is Fetal Alcohol Syndrome?
Fetal alcohol syndrome is a condition in a child that results from alcohol exposure during the mother’s pregnancy. Drinking alcohol during pregnancy can cause disabilities related to behavior, learning and thinking, and physical development. [3]
The symptoms of fetal alcohol syndrome vary from child to child, but they are lifelong. [3]
Fetal alcohol syndrome sits on the severe end of fetal alcohol spectrum disorders (FASD), a range of conditions in a child caused by the mother drinking alcohol during pregnancy. [3]
The single most important fact to understand: there is no amount of alcohol that’s known to be safe to drink during pregnancy. [3] If you drink during pregnancy, you place your baby at risk of fetal alcohol syndrome. [3]
If you suspect your child has fetal alcohol syndrome, talk to your doctor or other healthcare professional as soon as possible. Early diagnosis and treatment may help lessen some issues. [3]
When to See a Doctor
If you are pregnant and can’t stop drinking alcohol, ask your obstetrician, primary care doctor, or other healthcare professional for help. You may also choose to talk to a mental health professional. A social worker can direct you to community programs that offer help, such as Alcoholics Anonymous.
Because early diagnosis may help lessen the risk of some challenges for children with fetal alcohol syndrome, let your child’s healthcare professional know if you drank alcohol while you were pregnant. Don’t wait for your child to have issues before seeking help. [3]
One more situation worth knowing: if you adopted a child or are providing foster care, you may not know whether the biological mother drank alcohol while pregnant. International adoption from some countries may have a higher rate of alcohol use by pregnant mothers. [3] If you have concerns about your child’s learning or behavior, talk with your child’s healthcare professional to find out what might be causing these problems.
What Causes Fetal Alcohol Syndrome?
Understanding the cause matters because it explains two things at once: why the condition happens at all, and why there is no safe threshold. When you’re pregnant and you drink alcohol:
Alcohol passes through the placenta. Inside the womb, the placenta provides oxygen and nutrients to a developing baby. The alcohol reaches your baby by passing through the placenta. [3]
The baby’s blood alcohol level ends up higher than yours. Alcohol causes a higher blood alcohol level in your developing baby than in your body. That’s because a baby breaks down and gets rid of alcohol slower than an adult does. [3]
Alcohol is toxic to the baby’s cells. Exposure to alcohol before birth can harm how the body develops and cause permanent brain damage in the developing baby. [3]
Timing: Why the Earliest Weeks Matter Most
The more you drink while pregnant, the greater the risk to your unborn baby. [3] But any amount of alcohol puts your baby at risk. Your baby’s brain, heart, and blood vessels begin to develop in the early weeks of pregnancy, before you may know you’re pregnant. [3]
Pregnancy Stage | What Alcohol Can Damage |
First three months | Key development of the face and organs, including the heart, bones, brain, and nerves; drinking during this window can cause damage to how body parts develop [3] |
Later in pregnancy | Continuing development throughout the womb; drinking at any time during pregnancy remains damaging [3] |
The practical takeaway: damage can begin before many people realize they are pregnant, which is why the recommendation extends to anyone trying to conceive.
What Are the Symptoms of Fetal Alcohol Syndrome?
The severity of fetal alcohol syndrome symptoms varies. Some children have far greater problems than others do. [3] Symptoms may include any mix of issues across four areas: how the body develops, thinking and learning, daily functioning, and social and behavioral life.
Physical Development Issues
Sign | What It Looks Like |
Distinctive facial features | Small eyes, a very thin upper lip, a flat nose bridge, and a smooth skin surface between the nose and upper lip [3] |
Slow growth | Slow physical growth before and after birth [3] |
Developmental delay | Taking longer to reach milestones, such as sitting, talking, and walking [3] |
Sensory problems | Vision or hearing problems [3] |
Head and brain | Smaller than average head and brain size [3] |
Organ development | Changes with how the heart, kidneys, and bones develop [3] |
Movement | Poor coordination or balance; being jittery or hyperactive [3] |
Learning and Thinking Issues
Challenges with memory, learning new things, focusing, and thinking may appear, sometimes alongside intellectual disability and learning disorders. [3]
Children with fetal alcohol syndrome may have difficulty understanding the results of choices made, along with poor judgment skills: a hard time thinking through issues, problem-solving, reasoning, and making decisions that affect everyday life. [3]
Other thinking-related challenges include a short attention span that affects staying with a task and finishing it, a poor concept of time that impacts following schedules and understanding how long a task takes, and trouble with organizing, planning, and working toward a goal, including trouble understanding and following directions. [3]
Social and Behavioral Issues
In daily life and interactions with others, children may face challenges in school with attendance, learning, behavior, and interacting with others, plus trouble getting along with others, including struggling with communication and social skills. [3]
They may have trouble adapting to change or switching from one task to another, issues with behavior and with controlling emotions and actions, and problems managing life skills such as telling time, self care, managing money, and staying safe. [3]
Two signs parents and caregivers often describe stand out: being easily influenced by others or taken advantage of, and quickly changing moods. [3]
Fetal Alcohol Syndrome vs. Fetal Alcohol Spectrum Disorders
Fetal alcohol spectrum disorders describes the range of conditions in children caused when the mother drank alcohol during pregnancy. Symptoms vary greatly among children and can include all or a mix of physical, behavioral, and learning and thinking problems. [4]
FASD Condition | What It Includes | What It Does Not Include |
Fetal alcohol syndrome (FAS) | Behavior, learning, and thinking problems plus physical and growth changes that can affect any part of the body; the severe end of the spectrum [4] | — |
Alcohol-related neurodevelopmental disorder (ARND) | Intellectual disabilities or behavioral and learning problems [4] | Physical and growth changes [4] |
Alcohol-related birth defects (ARBD) | Physical development changes present at birth, such as problems with hearing, vision, and the heart, kidneys, and bones [4] | Learning and behavior problems [4] |
Neurobehavioral disorder associated with prenatal alcohol exposure (ND-PAE) | Challenges functioning in everyday life, thinking and remembering, behavior concerns, and day-to-day activities and social interactions [4] | — |
Partial fetal alcohol syndrome (PFAS) | Some symptoms of fetal alcohol syndrome, but the extent doesn’t meet FAS diagnosis guidelines; also called fetal alcohol effects [4] | Full FAS diagnostic criteria (PFAS is not common) [4] |
One practical note for families: if one child in a family is diagnosed with fetal alcohol syndrome, it may be important to evaluate siblings for fetal alcohol syndrome if the mother drank alcohol during those pregnancies. [4]
Who Is at Risk?
The risk relationship is straightforward: the more alcohol you drink during pregnancy, the greater the chance of problems in your baby. [3] There’s no known safe amount of alcohol to drink during pregnancy, and there’s no type of alcohol that is safe. [3]
You could put your baby at risk even before you realize you’re pregnant. [3] The guidance is clear: don’t drink alcohol if:
Situation | Guidance |
You’re pregnant | Don’t drink alcohol |
You think you might be pregnant | Don’t drink alcohol |
You’re trying to become pregnant | Don’t drink alcohol |
What Are the Possible Complications?
Behavior issues after a child is born can result from having fetal alcohol syndrome. These are called secondary disabilities, and they may include:
Secondary Disability | Description |
ADHD | Attention-deficit/hyperactivity disorder [3] |
Behavioral problems | Aggression, improper social behavior, and breaking rules and laws [3] |
Substance misuse | Alcohol or recreational drug misuse [3] |
Mental health conditions | Depression, anxiety, or eating disorders [3] |
School challenges | Challenges staying in or completing school [3] |
Social difficulties | Not being able to get along with others [3] |
Independence challenges | Challenges with independent living and getting and keeping jobs [3] |
Safety risks | Sexual behaviors that are not proper [3] |
Early death | Early death by accident, homicide, or suicide [3] |
This list looks alarming, and it is, but it is also why early intervention and a stable, nurturing home matter so much. They protect children with fetal alcohol syndrome from some of the other issues they’re at risk of later in life. [4]
How Is Fetal Alcohol Syndrome Diagnosed?
Diagnosing fetal alcohol syndrome involves an exam from a healthcare professional with expertise in the condition. Early diagnosis and services can help improve your child’s ability to function. [4]
Making a diagnosis involves talking about your drinking during pregnancy. Being honest with your healthcare professional about your alcohol use helps figure out the risk of fetal alcohol syndrome. Although fetal alcohol syndrome can’t be diagnosed before birth, the health of the baby and mother can be assessed and watched during pregnancy. [4]
It also involves watching for symptoms in your child’s early weeks, months, and years of life. The healthcare professional looks at your child’s physical appearance for changes typical of fetal alcohol syndrome and watches your child’s physical and brain growth and development. [4]
Over time, the healthcare professional watches for issues with physical growth and development, thinking and language development, health, and social interaction and behavior. [4]
Many features seen with fetal alcohol syndrome also may occur in children with other conditions. If fetal alcohol syndrome is suspected, your pediatrician will likely refer your child to an expert with special training, such as a developmental pediatrician, a neurologist, or another expert, who does an evaluation to rule out other conditions with similar symptoms. [4]
What Treatments Are Available?
Here’s the honest baseline: there’s no cure or specific treatment for fetal alcohol syndrome. The physical and mental conditions caused by alcohol exposure before birth are lifelong. But early intervention services may help lessen some of the challenges and may help prevent some secondary disabilities. [4]
Support Type | Who Helps | What It Addresses |
Medical care | Healthcare professionals | Care for vision, hearing, or heart conditions; medicines may help with some symptoms [4] |
Early intervention | Speech therapist, physical therapist, occupational therapist | Walking, talking, and social skills [4] |
Education support | Special education teacher, psychologist or other mental health professional | Learning and behavioral issues [4] |
Employment support | Vocational rehabilitation services | Getting and keeping a job [4] |
Independence training | Life skills training professionals | Social skills, coping, communication, problem-solving, and decision-making [4] |
Family support | Mental health professionals | Helping parents and family members cope with a child’s behavioral problems [4] |
Substance misuse counseling | Counselors who deal with substance misuse | Alcohol and recreational drug misuse, if needed [4] |
Treatment for the mother’s alcohol misuse can also help with better parenting and prevent future pregnancies from being affected. Substance misuse counseling and treatment programs can help with overcoming alcohol or recreational drug use, and joining a support group or 12-step program such as Alcoholics Anonymous may help. [4]
Coping and Support: Parenting Strategies That Help
The challenges that occur along with fetal alcohol syndrome can be difficult to manage for the person with the condition and for the family. Children and their families may benefit from the support of professionals and other families who have experience with this condition. [4] Ask your healthcare professional, social worker, or mental health professional for local sources of support.
To help your child, use these parenting skills:
Parenting Skill | Why It Helps |
Recognize your child’s strengths and limitations | Builds confidence and realistic expectations |
Set up and keep daily routines | Predictability supports children who struggle with change |
Create and enforce simple rules and limits | Structure reduces behavioral friction |
Keep things simple with clear, specific language | Direct language supports comprehension |
Repeat things to reinforce learning | Repetition supports memory challenges |
Point out acceptable behavior and use rewards | Positive reinforcement builds good habits |
Teach skills for daily living and social interaction | Prepares the child for independence |
Guard against your child being taken advantage of | Protects against easy influence by others |
Early intervention and a stable, nurturing home are important to protect children with fetal alcohol syndrome from some of the other issues they’re at risk of later in life. [4]
How Can Fetal Alcohol Syndrome Be Prevented?
To prevent fetal alcohol syndrome, don’t drink alcohol during pregnancy. Fetal alcohol syndrome is completely preventable in children whose mothers don’t drink at all during pregnancy. [3] Here are four steps to help:
Don’t drink alcohol if you’re trying to get pregnant. If you haven’t already stopped drinking, stop as soon as you know you’re pregnant or if you even think you might be pregnant. It’s never too late to stop drinking during your pregnancy; the sooner you stop, the better it is for your baby. [3]
Don’t drink alcohol at any time during your pregnancy. Fetal alcohol syndrome is completely preventable in children whose mothers don’t drink at all during pregnancy. [3]
Consider giving up alcohol during your childbearing years if you’re sexually active and having unprotected sex. Many pregnancies are unplanned, and damage from alcohol can happen in the earliest weeks of pregnancy. [3]
If you have an alcohol problem, get help before you get pregnant. Talk to your healthcare professional or a mental health professional about your drinking. Review how much and how often you drink alcohol so that together you can create a treatment plan to help you quit. [3]
Preparing for Your Appointment
Call your child’s doctor or other healthcare professional for an appointment if you have any concerns about your child’s growth and development. You may want to ask a family member or friend to come with you to help remember all the information provided.
What you can do. Before your appointment, make a list of any symptoms you’ve noticed in your child (including any that may seem unrelated, and when they began), all medicines, vitamins, herbs, or supplements you took during pregnancy with their doses, and, if you drank alcohol during pregnancy, tell your child’s healthcare professional how much you drank and when. Also bring the questions you want to ask, such as:
What’s the most likely cause of my child’s symptoms?
Are there other possible causes?
Should my child see a specialist?
Will my child’s condition get better over time? Will it get worse?
What treatments are available, and which do you recommend?
Are there medicines that can help? Are there medicines that should be avoided?
How can I prevent this from happening in future pregnancies?
Do you have any material or websites that can help me learn more?
What to expect from your doctor. Your healthcare professional is likely to ask questions such as whether you drank alcohol while pregnant (and how much and how often), whether you used any recreational drugs during pregnancy, whether you had any problems with the pregnancy, when you first noticed your child’s symptoms, whether symptoms are ongoing or come and go, and what seems to make the symptoms better or worse. [4]
Conclusion: Fully Preventable, Better With Early Help
Fetal alcohol syndrome is a lifelong condition caused by alcohol exposure during pregnancy, with no cure and no safe threshold, but it is also completely preventable when no alcohol is consumed during pregnancy, and its impact is meaningfully reduced by early diagnosis and intervention. [3] [4] The evidence points in two clear directions at once: prevention starts before pregnancy (and in the earliest unplanned weeks), while support for children already affected, through early intervention services, structured parenting strategies, and family support, can improve functioning and prevent many of the secondary disabilities that follow. If you have any concern, an open conversation with a healthcare professional is the single best first step, whether you’re pregnant, planning to conceive, or raising a child.
Related on Rinnit: Fetal Alcohol Spectrum Disorders (FASD): Symptoms, Types, Causes, Diagnosis, Treatment and Prevention · ADHD: Complete Guide to Symptoms, Causes, Diagnosis & Treatment
Further reading: Mayo Clinic — Fetal Alcohol Syndrome
Frequently Asked Questions
1. What is fetal alcohol syndrome?
Fetal alcohol syndrome is a condition in a child that results from alcohol exposure during the mother’s pregnancy. It sits on the severe end of fetal alcohol spectrum disorders (FASD) and includes problems with behavior, learning, and thinking, plus physical and growth changes that can affect any part of the body. Symptoms vary from child to child but are lifelong. [3]
2. Is any amount of alcohol safe during pregnancy?
No. There is no amount of alcohol that’s known to be safe to drink during pregnancy, and there is no type of alcohol that is safe. Any amount of alcohol puts the baby at risk. [3]
3. Can fetal alcohol syndrome be diagnosed before birth?
No. Fetal alcohol syndrome can’t be diagnosed before birth, but the health of the baby and mother can be assessed and watched during pregnancy. Diagnosis involves an exam by a healthcare professional with expertise in the condition, often after referral to a developmental pediatrician or neurologist. [4]
4. What are the signs of fetal alcohol syndrome in a child?
Signs may include distinctive facial features (small eyes, a very thin upper lip, a flat nose bridge, a smooth skin surface between the nose and upper lip), slow physical growth before and after birth, a smaller than average head and brain, developmental delays, and challenges with learning, behavior, coordination, and social skills. [3]
5. Is fetal alcohol syndrome curable?
No. There is no cure or specific treatment for fetal alcohol syndrome, and the physical and mental conditions are lifelong. But early intervention services can help lessen the challenges and may help prevent some secondary disabilities. [4]
6. What are the different types of fetal alcohol spectrum disorders?
The range includes fetal alcohol syndrome (FAS, the severe end), alcohol-related neurodevelopmental disorder (ARND, learning and behavior problems without physical changes), alcohol-related birth defects (ARBD, physical defects without learning problems), neurobehavioral disorder associated with prenatal alcohol exposure (ND-PAE), and partial fetal alcohol syndrome (PFAS, some symptoms that don’t meet full FAS criteria). [4]
7. Does fetal alcohol syndrome get worse over time?
The underlying condition is lifelong and doesn’t go away, but outcomes vary widely. Early intervention, a stable nurturing home, and good parenting strategies can improve a child’s ability to function and reduce the risk of secondary disabilities like substance misuse, mental health conditions, and difficulty keeping a job. [3] [4]
8. I drank alcohol before I knew I was pregnant — what should I do?
Stop drinking as soon as you know you’re pregnant or even think you might be pregnant. It’s never too late, and the sooner you stop, the better it is for your baby. [3] Talk to your obstetrician or primary care doctor about it honestly so your pregnancy can be assessed and watched properly.
9. Should siblings be tested if one child has fetal alcohol syndrome?
If one child in a family is diagnosed with fetal alcohol syndrome, it may be important to evaluate siblings for the condition if the mother drank alcohol during those pregnancies. [4]
10. How can I get support as a parent of a child with FAS?
Ask your healthcare professional, social worker, or mental health professional for local sources of support for children with fetal alcohol syndrome and their families. [4] Support from professionals and other families who have experience with the condition can make a real difference.
References
Lange S, Probst C, Gmel G, Rehm J, Burd L, Popova S. Global prevalence of fetal alcohol spectrum disorder among children and youth: a systematic review and meta-analysis. JAMA Pediatr. 2017;171(10):948-956. doi:10.1001/jamapediatrics.2017.1919. PMID: 28828483.
Popova S, Lange S, Shield K, et al. Comorbidity of fetal alcohol spectrum disorder: a systematic review and meta-analysis. Lancet. 2016;387(10022):978-987. doi:10.1016/S0140-6736(15)01345-8. PMID: 26777270.
Mayo Clinic Staff. Fetal alcohol syndrome: symptoms & causes. Mayo Clinic. June 13, 2024. https://www.mayoclinic.org/diseases-conditions/fetal-alcohol-syndrome/symptoms-causes/syc-20352901
Mayo Clinic Staff. Fetal alcohol syndrome: diagnosis & treatment. Mayo Clinic. June 13, 2024. https://www.mayoclinic.org/diseases-conditions/fetal-alcohol-syndrome/diagnosis-treatment/drc-20352907
Medical Disclaimer
This article is for informational purposes only and does not constitute medical advice. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read here.
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