I would try them, he might want the faster flow. also check to make Sure the nipple is not clogged...happened to us a few times...she didn't like that lol.

@eskawho, my son eats 4oz and looks like hes having trouble with the slow flow ones it takes him longer to eat now.

4oz is what my daughter drinks

every baby is different but mine was eating 4 ounces every 3 to 4 hours. yours will let you know what's to much or not enough. ad for the nipples I tried at 3 months my daughter didn't like the faster flow and her pediatrician that's ok. at 8 months she still uses the slow ones lol