10 day pp

How.much is your 10 day old eating? How often? My ped said 2oz every 2 hrs but I feel.as tho he's not getting enough to eat as he starts smacking his lips and rooting only an hr later. I'm trying to exclusively pump but im not making enough I only get about an. Ounce an hr every 2hrs. So I supplement but im getting frustrated that he wakes up crying of hunger an hour after..any advice would be appreciated