For medication fears, the best source is Thomas Hale, an american clinical researcher. http://neonatal.ama.ttuhsc.edu/lact/ is his webpage.

He's done actual research on different drugs and how to manage them. There's a book which can be waved at doctors.

Not all treatment for depression has to be drugs, and not all drugs have to be harmful to the baby, but untreated depression can be very harmful indeed to the baby.