Under normal circumstances, the mother cat can't give birth safely until her body develops to a certain extent. Early pregnancy will cause a great burden on the mother cat's health, and may even lead to some serious health problems. Generally speaking, female cats can reach sexual maturity when they are 6-7 months old, but this does not mean that they can get pregnant and give birth safely. Therefore, professional pet doctors usually recommend waiting until the mother cat is about one year old before considering pregnancy and childbirth.
In addition, the first pregnancy and delivery of female cats also need certain experience and skills. If the owner and family members do not have the relevant knowledge and skills, it may cause difficulties and complications in childbirth. In this case, the health of both the mother cat and the kitten will be affected.
Generally speaking, the reason why female cats can't keep their first child is mainly to avoid the risk of age and health problems, and also to consider the professional knowledge and skills during pregnancy and childbirth. If the owner and family have the relevant knowledge and skills, and the female cat is healthy enough, then she can be considered to be pregnant and give birth.