my baby boy is 9 Months he was born premature he would be 7 months now if he would be born on his actual day.

Doll • Premie baby born Feb 23. Due date April 15th. 🙏👶💙 Follow me on insta -ZULLYBRITO
I've tried so many nipples/Bottle like avent ,essentials first,and a cartoon bottle nothing works he sucks but little milk come out he gets mad cause nun comes out and the avent #3 nipple is for 6+ month up and it's too fast for him he chokes sometimes. WHAT DO U RECOMEND ?:/