Bottle fed but still starving?

Tiffany • 💕Mommy 06/13/18 ❤️ baby #2 due March 2020! taken 10/28/16😍 boy momma🥰 C-section momma💪🏻

My son will be 3 months old this coming Thursday, he eats 4oz every 2 hours, and eats rice once a day and a rice bottle at night (his peds said it’s fine) but he still acts like he’s starving, he’s on the Gerber Gentle formula. We’ve tried bumping him up to 5oz but then he vomits it all back up. Anyone else have this problem? Any suggestions on what to do?