I understand how not to feed it anything larger than its thickest part. But I've seen plenty of videos of wild snakes with something almost 4x's the thickest part. I'm sure not condoning it but I guess the snake wouldn't have too much of an issue. But make sure not to feed it something if you are going to get even a bit worried about it. Just feed it something you are confident that it will be able to digest no problem.