LOL @ KR
When you choose to have a baby, you take on responsibility for another person other than yourself. If you're not pregnant, then whatever you put into your body affects only you. This includes food, drink, medicinal drugs, and recreational drugs. (I'm setting aside the issue of secondhand smoke for the moment.) But if you've chosen to have a child, then for the 9 months of your pregnancy and for however long you breastfeed, everything you put into your body affects that baby as well.
I am making the assumption that the baby was wanted, because it was delivered, which implies that she was well into her third trimester if not actually due.
Becoming a mother is about the most selfless thing you can do. But it comes with certain responsibilities, and you can't pick and choose which responsibilities to honor and which to ignore.