About four weeks after birth, small cats become slowly accustomed to kitten food. At about three months, they only eat solid foods. Very picky cats can receive kitten milk as a supplement. Any changeover should also take place slowly, since their small stomachs are still very sensitive. The so-called conditioning phase also takes place in the first few months. Offer your baby cat the kitten formula that you like, but definitely mix up varieties. The more your cat gets to know it during this time, the more flexible and uncomplicated with food it will be later.