@junesmommy15, I'm only breastfeeding but I was thinking about pumping and doing bottles because I'm not sure if I'm making enough milk. It seems like he never gets full.
Do you have a pretty big supply? Also do you pump? That could be causing it. That's what was happening with my baby. I have to sometimes hand express milk out of my breast before I feed my son so that he doesn't get too much foremilk which was causing his gas and sometimes green poop. If you feel very full before feeding him try doing that. He wouldn't sleep well at all but once I stopped pumping and my supply regulated he hasn't been gassy since.
@junesmommy15, and I never really get full like I did in the beginning. I hardly ever leak or get really full.