Baby Teeth Loss. Kittens do indeed lose all of their 26 baby teeth, just like human children lose their baby teeth, the ASPCA indicates. A kitten generally starts losing teeth at 3 months, around the time her adult incisors begin to slowly grow in.The incisors are followed by adult molar, premolar and canine teeth.ittens grow up so quickly. The little ones seem to lose their baby teeth as rapidly as they get them. Your furry cutie's deciduous teeth -- her first teeth -- probably will begin falling out when the kitten is 12 weeks old. That's about the time the adult set starts emerging.