Mice breeding...

[nouserpif]

I am going to be buying a few adult mice, and give the pinkies to my bearded, he went off eating for a bit (don't ask me why... I have no idea), then I got him eating again (back to his "Is that food?!? Oh, no? well, goodbye, I'll plop myself down on this rock untill you get me some... ungrateful little human....", but he is still skinny, adn needs some fattening up. So, How do I do it? dumb it down.... thanks!