My baby is 1 week old and breastfeeding is not enough for him, he cries hysterically after being on each breast for an hour each. So I started supplementing with formula. I'm giving him Enfamil but it makes him extremely gassy and he hasn't had a BM in a day now. The doctor says to wait 3 days before I call, but I'm a FTM and I'm getting paranoid. Has anyone had success with any other formulas? I was reading good things about Gerber Goodstart Gentle, any suggestions?