my baby will be a month old in 9 days and eats 2 1/2 oz most of the time and once or twice a day she will eat 3 oz.
every baby is different. my baby was eating 3 oz. by 1 month so im sure 4oz is fine. but if you are concerned you can call your babys doctor and double check but im sure its fine.
yeah it is! that's what son you used to eat(: now he's at 6 2oz and he's 2 months