As long as the baby is eating and is still producing wet and dirty diapers all is fine. My son is about to be a year old and weighs as much as a 5 month old. He just can't gain weight but he is healthy. He only eats 5 oz in each bottle about every 3-4 hours. We are feeding him food too but his main diet is still bottle per doctors orders.

they are all different..as long as baby is gaining weight i wouldnt worry :)