My son Isaiah will be 3mo old on April 11th, He typically eats 4oz every few hours. Recently he’s been fussy after he eats (after every other or every few feedings). Sometimes he is satisfied with 4oz other times we feed him 4.5oz. My husband & I aren’t sure if we should feed him 4.5oz every feeding or go straight to 5. Is 5oz normal for a 3mo old?

(Isaiah was Born at 5 lbs. 8 oz. and his pediatrician said he had more weight that he needed to gain to catch up unlike a baby that was born weighing 8lbs. I have a friend whose son moved up to 5oz at five months old, with Isaiah being almost 3mo old we are worried that we will be overfeeding him)