Hello. My son is about to turn 3 months old and he is being formula fed since the begining. As he was born we would give him 30-60 ml of Nan pro. Till few days back we could not increase his per feeding and he was still being given 60 ml. recently we have tried to increase it to 90 ml per feed but he sometimes refuses to have the whole 90 ml. sometimes he even spits some of the milk out. I am concerned as I have heard that babies increase their per feed with age and gap between feeds increases. I am still feeding him between every 2 to 3 hours and 90 is the maximum I can make him have in one go. what can be done?