Causes

When you're pregnant and you drink alcohol:

• Alcohol enters your bloodstream and reaches your developing fetus by crossing the placenta
• Alcohol causes higher blood alcohol concentrations in your developing baby than in your body because a fetus metabolizes alcohol slower than an adult does
• Alcohol interferes with the delivery of oxygen and optimal nutrition to your developing baby
• Exposure to alcohol before birth can harm the development of tissues and organs and cause permanent brain damage in your baby

The more you drink while pregnant, the greater the risk to your unborn baby. However, any amount of alcohol puts your baby at risk. Your baby's brain, heart and blood vessels begin to develop in the early weeks of pregnancy, before you may know you're pregnant.

Impairment of facial features, the heart and other organs, including the bones, and the central nervous system may occur as a result of drinking alcohol during the first trimester. That's when these parts of the fetus are in key stages of development. However, the risk is present at any time during pregnancy.