Fetal alcohol syndrome (FAS) is a range of birth defects that can occur in a child whose mother drinks alcohol during pregnancy. These defects can include physical, mental, and behavioral problems. FAS is the leading preventable cause of intellectual disability in the United States.
The effects of alcohol on a fetus can vary depending on the amount of alcohol consumed, the stage of pregnancy, and the individual fetus. However, even small amounts of alcohol can cause problems. There is no safe level of alcohol consumption during pregnancy.