First few weeks- key period in kittens’ development
At that time, the mother, siblings and the people have the most important impact on the kitten. The future character of the young cat is being shaped. One cannot take a day from that time because every day is an epoch ... it's years compared to the human species. All outside signals, events and emotions that the little kitty experiences during the period of primary socialization remain in their memory and have a huge impact on their behaviour in the future.
The sense of security in the family nest is very important, thanks to which the kitten gains the courage to explore the world around them. By separating the kittens from the mother too early, we can permanently hurt them.