Is he eating too much

My baby is 2 weeks and breast and formula fed. Some days i give him formula and some breastmilk since I have a huge supply and put it in bags for him but When he goes formula he drinks almost 8oz within a 2-3hr period. For example he drunk 4.25oz a hour in a half ago. Now he’s drinking another bottle. His pedi isn’t concerned about his weight since he was 5lbs at birth, he gained a pound in 3days when we were discharged from the hospital and the next week ANOTHER pound. He’s now 7lbs 2oz.