My 2 week old is eating well but he is doing this thing every so often where I change and feed him…

My 2 week old is eating well but he is doing this thing every so often where I change and feed him and after I feed him he stays awake and starts to root like he’s still hungry. Sometimes I think maybe he is just doing it for no reason lol but he starts to get fussy if I don’t keep feeding him. So I just feed him and he eats a little on and off for a couple of hours (makes it very difficult to take care of my other son). He ends up fussing even more and spits up all over himself. Mamas what do I do? He is a premie and I guess I’m just very nervous about the spit up and the fussing