Fetal alcohol syndrome
Alcohol in pregnancy; Alcohol-related birth defects; Fetal alcohol effects; FAS; Fetal alcohol spectrum disorders; Alcohol abuse - fetal alcohol; Alcoholism - fetal alcohol
Fetal alcohol syndrome (FAS) is growth, mental, and physical problems that may occur in a baby when a mother drinks alcohol during pregnancy.
Using alcohol during pregnancy can cause the same risks as using alcohol in general. But it poses extra risks to the unborn baby. When a pregnant woman drinks alcohol, it easily passes across the placenta to the fetus. Because of this, drinking alcohol can harm the unborn baby.
There is no "safe" level of alcohol use during pregnancy. Larger amounts of alcohol appear to increase the problems. Binge drinking is more harmful than drinking small amounts of alcohol.
Timing of alcohol use during pregnancy is also important. Drinking alcohol is likely most harmful during the first 3 months of pregnancy. But drinking alcohol any time during pregnancy can be harmful.
A baby with FAS may have the following symptoms:
- Poor growth while the baby is in the womb and after birth
- Decreased muscle tone and poor coordination
- Delayed developmental milestones
Exams and Tests
A physical exam of the baby may show a heart murmur or other heart problems. A common defect is a hole in the wall that separates the right and left chambers of the heart.
There also may be problems with the face and bones. These may include:
- Narrow and small eyes
- Small head and upper jaw
- Smooth groove in the upper lip, smooth and thin upper lip
Tests that may done include:
- Blood alcohol level in pregnant women who show signs of being drunk (intoxicated)
- Brain imaging studies (CT or MRI) after the child is born
- Pregnancy ultrasound
Women who are pregnant or who are trying to get pregnant should not drink any amount of alcohol. Pregnant women with alcohol use disorder should join a rehabilitation program and be checked closely by a health care provider throughout pregnancy.
The following organizations may offer assistance:
- National Council on Alcoholism and Drug Dependency --
- SAMHSA National Helpline -- 1-800-662-4357
The following organizations are good resources for information on alcoholism:
- Alcoholics Anonymous --
- Al-Anon Family Groups --
- National Institute on Alcohol Abuse and Alcoholism --
- Substance Abuse and Mental Health Services Administration --
The outcome for infants with FAS varies. Almost none of these babies have normal brain development.
Infants and children with FAS have many different problems, which can be difficult to manage. Children do best if they are diagnosed early and referred to a team of providers who can work on educational and behavioral strategies that fit the child's needs.
When to Contact a Medical Professional
Call for an appointment with your provider if you are drinking alcohol regularly or heavily, and are finding it difficult to cut back or stop. Also, call if you are drinking alcohol in any amount while you are pregnant or trying to get pregnant.
Avoiding alcohol during pregnancy prevents FAS. Counseling can help women who have already had a child with FAS.
Sexually active women who drink heavily should use birth control and control their drinking behaviors, or stop using alcohol before trying to get pregnant.
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Falck AJ, Mooney SM, Bearer CF. Adverse exposures to the fetus. In: Martin RJ, Fanaroff AA, Walsh MC, eds. Fanaroff and Martin's Neonatal-Perinatal Medicine Diseases of the Fetus and Infant. 10th ed. Philadelphia, PA: Elsevier Saunders; 2015:chap 15.
Hoyme HE, Kalberg WO, Elliott AJ, et al. Updated clinical guidelines for diagnosing fetal alcohol spectrum disorders. Pediatrics. 2016;138(2). PMID: 27464676
Niebyl JR, Weber RJ, Briggs GG. Drugs and environmental agents in pregnancy and lactation: Teratology, epidemiology. In: Gabbe SG, Niebyl JR, Simpson JL, et al, eds. Obstetrics: Normal and Problem Pregnancies. 7th ed. Philadelphia, PA: Elsevier; 2017:chap 8.
Last reviewed on: 8/31/2016
Reviewed by: Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.