I've been bf and bottle feeding my 7 wk old. When I pump I've been putting together 4 oz bags of milk. He eats every 2 hours on the dot and is perfectly satisfied after his bottle. Is this too much for a 7 wk old per feeding? Should I take it down to 3 oz bags? He is my 3rd child but the only one I'm continuing to bf past 4 wks. Thanks in advance for any suggestions.