From now on , a French law authorises only breeders to sell kitten or puppies in order to protect pets and avoid smugglings .

Why neutered/sterilise a Kitten?

Because if not, he or she will wander in order to find a female or a male to mate with therefore increase the risk of disappearance
To prevent fights with other males and therefore avoid injuries and transmission of diseases.
to avoid territory's markings inside your house
to avoid loud meows days and nights during heat periods,
to avoid contraceptive pill for females (cancer risks)

Please be aware that the essential oils inhaled, poisoned the cats' liver and some plants are highly toxic to cats if ingested. Before adopting a kitten check your environment..

"a house without a cat is an aquarium without fish"

Jean-Louis Hue