Fetal alcohol synrome (FAS) is a disorder of permanent birth defects that occurs in the offspring of women who drink alcohol during pregnancy. It is unknown whether amount, frequency or timing of alcohol consumption during pregnancy causes a difference in degree of damage done to the fetus. Thus, the current recommendation is not to drink at all during pregnancy. Alcohol crosses the placental barrier and can stunt fetal growth or weight, create distinctive facial stigmata, damaged neurons and brain structures, and cause other physical, mental, or behavioural problems.