The best way to check if they're getting enough, really, is body condition - feel their rib cage - make sure it feels appropriate; not too buried and not too prominent. It may also be that he *loves* his new food so much, that he just is excited for it and wants it NOW, Mommy, NOW
! So, maybe he's not actually hungry - but just excited? My Wylie is that way - super excited about meal time - where Marcel is all patient and easy-breezy. Maybe give a snack before bed time?