Cats are, of course, excellent mothers in every respect, designed by nature to provide food, warmth, nurture and defense. But if cat moms are warm and loving, they certainly aren’t sentimental. By the time her kittens are about fifty days old, a mother seems to realize they are ready for the world.
Her work is done, and there is no anxiety about being separated from the kids, nor are the kittens sad at leaving home. However, breeders as a rule don’t separate the mom cat from the kittens all at once but generally remove one kitten at a time from the litter, one kitten per day. This makes it easier for mom to return to her premother life.