Depression following pregnancy generally follows naturally from depression *during* pregnancy.
Leah Rai is right: one of the best things you can do is follow the LEVity plan (it's a book, not too hard to find):
Light (outside, even on grey, overcast days) is essential for sanity --at least an hour every single day.
Exercise (hey, you'll be outside anyhow, go for a walk)... at least an hour of movement a day --whether in 10 minute bursts or all at once, it makes no difference at all
Vitamins: you need to make sure that your diet is low in simple carbs (white bread, white rice, white pasta and sugars --check those processed food labels, it's in EVERYTHING!) and high in food --real food, like a potato, a tomato, a carrot, a chicken leg, an apple. Take a multivitamin with an emphasis on B vitamins (lots of the ones that say 'stress' on the label are good), but eat good food mostly.
And drink water. And sleep lots.
at 3:43 PM on Jan. 24, 2011