Too much???

Is it normal for a 3 month old to drink 6oz of milk every 3-4 hrs?? He is formula fed and was over 10lbs at birth. Almost 16lbs by the end of June..

He gets 5 ounces but sometimes he just whines after I take the bottle away after he chugs the 5 ounces.

Not want to feed him way over but my neice is already 9 months old yet my LO eats like her already except the solids.