Illustration of baby with Fetal Alcohol Syndrome. Fetal Alcohol Syndrome or (FAS) is a condition in infants that is caused by alcohol consumption by the mother during time of pregnancy. Mental and physical defects such as a small head, flat face, epicanthal folds, smooth philtrum, thin upper lip, small eye openings, short nose, low nasal bridge, and underdeveloped jaw, are common symptoms of fetal exposure to alcohol.