I have a daughter who's almost 5 months old and I wasn't breastfeeding when she was born. After a lot of defiance (the joys of going from bottle to breast), I'm fully breastfeeding her now and she won't take anything else from me. 
I'm 13 weeks pregnant and I'm worried with my rubbish diet that my babies won't be getting enough to nourish them. My daughter seems to get enough milk and she doesn't seem to be going hungry. But I keep reading about breastfeeding burning 500 calories a day. I barely eat above 1400 cals a day, typically less, but I am trying to improve that though. I know breastfeeding is best for my little girl, so I don't want to wean her off it. Am I comprising my pregnancy?
Does anybody have any advice? 