Serious breeders take courses and seminars to obtain the information necessary for responsible breeding.
They know which specimens to breed so that, when you take a puppy home, it doesn't give you genetic, health or character problems.
They will always give them high-quality feed and wet food to ensure their good development and that they grow healthy, big and strong.
They offer support for life. Any doubt, question, problem... Whatever. A breeder will always be there, because he has the necessary knowledge and experience to do so and because from gestation to the day the kittens leave home there is absolute dedication to them.