Nope, my vet said it is healthy for a cat to have 1 litter, just like it is in humans, and as for twelve year olds it is only ethically wrong for them to have children.
We wouldn’t be made the way we were if that was the case.
If humans didn’t treat animals so cruel do you think that a vet would be guiding you away from your cat having a litter?
My vet was honest, he said even though there are lots of strays and neglected cats, it is healthy for a cat to have 1 litter. If you have a problem I’ll take it up with him yourself