The saying that cats have only children.
How many cats are born is related to the cat's genes and the conditions at the time of conception. And there is a saying in some places that "only two cats and one dog are allowed". Feudal superstition says that cats usually have multiple births. If the cat gives birth to one, it is said that the cat demon ate all his brothers and sisters. So your mother cat only gave birth to a kitten, which is very unlucky. That's good. This kitten has enough milk. It must look funny. There is nothing wrong with her family. Don't believe those superstitious stories.