Am sure he will be fine. As long as the prey item is x1.5 his widest part or less you will have no problems. My 3 month old Kingsnake is on fuzzies already- takes a while for him to get it in his mouth but then it goes down no problems.
just moved chester up from 2-3 fuzzys to med mice. it looked huge next to him but he squeezed it all in and his lumps was just right. not overly big. think he could have took one months ago.