Am I feeding my 3 week old baby too much if he eats 4oz?

I'm on my 3rd son..that is a good amount all my son's were same way 4 oz. From newborn to 2 months or so

If he eats it all and doesn't throw it up then he's good.

No. My son ate alot! And hes perfectly healthy. Some babies eat more than others.

That sounds about how mine was at that age. I just fed baby on demand.