Formula amount for newborn

Kristin • Mom to 2 beautiful boys 💙💚

My son will be 4 weeks old in a few days and he seems to still be hungry after he eats. He was eating 3 oz every feeding and I just increased it to 3 1/2 oz today but I was wondering if 4 oz would be too much for him? He seems to be doing better with 3 1/2 and he’s not spitting up a lot after eating but I’m just afraid of over feeding him too early.