Almost right after they are born. Dont worry to much about it, mother instincts tend to kick in. It sounds gross right now, but if you and jesse decide to have a kid, when you are ready, it will just seem....natural. I was pretty grossed out about breast feeding, but then when I got pregnant, lots of things were not gross any more.
Child birth, on the other hand, is the absolute of disgusting. it is just foul. but, the few minutes after words, it doesnt matter, becuase you have this really cool little alien looking thing in your arms.