When a female cat is giving birth to a child, taking care of her child is the most important thing. During this period, she will want to find a safe place for the cat and change the kitten's nest. In this case, it may be that an outsider enters the home and touches the kitten. The mother cat feels a different smell and is afraid that the kitten is in danger, so she will move the kitten with the kitten in her mouth. The breeder should not stop the mother cat. Just help with the replacement after you select it.