Is my baby over eating?

Manda • Noah Raymond Blackford. 19/13/15
My little man is 3 months old he was born 6 weeks early at 34 weeks he eats 4 oz bottles every 3 hours at each feeding but the last 3 days he has been wanting to eat every 2 hours is this okay or is he over eating. He has caught up in weight he is over 12lbs now.