H.S.
Hi A.,
My infant son was alot like that. I would guess Paul is not completely full. I pump breastmilk and feed from a bottle, and at 5 weeks, my son ate 6oz at a time every 3-4 hours. I didn't make enough milk, so I mixed it with formula. An extra ounce or two at that 4am feeding may make a world of difference. I did a 1am and 4am feeding for weeks!!! Your little guy was big at birth and I personally don't think its unusual to feed 6 or 8 oz of milk at 5 weeks. My pediatrician has always told me to feed them as much as they want. If they are spitting up alot, they are getting too much at one time. If your son holds down is feedings, he just isn't getting satisfied with the amount he is given! Good luck!