How Do I Feed a Newborn Kitten? A mother cat’s milk provides everything a kitten needs during the first four weeks of life. If you have newborn kittens who’ve been separated from their mother, consult with a veterinarian, shelter or experienced foster care giver who can help you find a new mother cat with a small litter-she may be able to nurse the orphaned babies. If you cannot find a foster mother, please consult with your veterinarian about the proper way to bottle-feed with a commercial milk replacer. Please do not offer regular cow’s milk to cats of any age. It is not easily digestible and can cause diarrhea. Source: WebMD