Bunny, first of all...Welcome to Pet Talk! That is too funny that you brought up the subject of pumpking, but on another thread, a vet suggested pumpkin mix for constipation! So, my guess would be that your baby is fine and pumpking is not bad for kitties!!!
On a side note, when I worked at Wolf Park, we would give pumpkins to the wolves as treats and they LOVED them!! Not sure what it is about pumpkins...but animals seem to like them!