Due to their age and lack of experience, kittens are much more curious than adult cats. That is why they try to stick their nose everywhere, examine all the cracks and put everything in their mouth. Think about the safety of your home for a kitten.
I am often asked the question: "Is it necessary to sterilize a cat? Will it harm her health? Maybe it is worth letting her giving birth at least once? And in general I feel sorry for her..."