You are not a bad mommy, if you were you wouldn't even be concerned about them. My RB Lola started to get quite a belly, untill I stopped letting her eat at will. I think a big problem is indoor cats have a tendency to turn to food rahter frequently as a source of entertainment, stimuli, favorite pastime etc. It will be an adjustment though....and It's tough. Just stick with it and he'll get used to it! Good luck!