Actually, it's best if you don't see a noticeable bulge, maybe a slight thickening, but no bulging and tight skin after they have eaten. If you feed too large of prey, there's a good chance that the snake will fast for 2-3 consecutive weeks in order to catch up. Smaller meals, once per week, will help your snake feed more regularly and stay on a schedule. My adults, even the 2600g girl(now 1900g after egg laying), don't get more than 3 mice every week. The babies/juvies might get 1-2 mice per week, depending on the size of the mice.