Talk to his pediatrician if that's something concerning you. Baby will tell you when he's full, so if he's still hungry, just feed him. :)

My son went thru a phase of doing that last week. I just fed him until he was full because I figured he wasn't throwing it up so he must have still been hungry n not over fed it only lasted less than a week tho he's back to drinking 2-3oz now

my little girl would do that at times. I just let her feed til she's full. now she's 2 months old and eats 4-5 oz still per feeding.