What can i do if my friend is bulimic and might be pregnant. how can her bulimia affect her baby?

A LOT: Similarly to the mother's starvation, i think. A lack of essential nutrients and other things. Also a pregnancy where one is encouraged to have a proper diet and the need to resist eating should make for internal conflict and stress in a mother. Current research says that this has a negative effect on a fetus. Your friend needs her ob, internist and psychiatrist working together. She needs friends.