Fetal alcohol syndrome (FAS) is the term for severe birth defects caused by heavy alcohol use during pregnancy.

Children with FAS may have:

• Distinctive facial features, which include a small head, flat face, narrow eye openings, a short upturned nose, a flattened groove between the nose and the upper lip (philtrum), and a thin upper lip.
• Low birth weight and slowed growth.
• Central nervous system abnormalities, including small head size, intellectual disability, poor fine motor skills, or poor eye-hand coordination.
• Behaviour and thinking (cognitive) problems, which may include poor attention, concentration, memory, and comprehension skills; difficulty with math skills; hyperactivity; and extreme mood changes.

A child with FAS may also have birth defects that involve the eyes, ears, heart, urinary tract, or bones.