Feed the mommy kitten food, its high in protein and fat which is essential for a nursing mommy. Mix it in with her regular diet and let her enjoy. Once shes done nursing, about four and a half weeks, take her off the kitten food so she doesn't gain any unnecessary weight. I suggest Iams kitten food, others will disagree, but it worked great for my momma rat, and Iams' dry isn't contaminated.