The reasons why big cats are afraid of new kittens:

1. It may be because cats have territorial awareness. When a new cat arrives, the big cat is afraid that the new cat will occupy it. territory.

2. It may also be caused by the older cat being afraid that the new cat will steal its owner.

3. It is also possible that the older cat is afraid that the new cat will compete with it for food, toys, etc.

Solutions to the big cat being afraid of the new kitten:
1. You can first feed the big cat and the new kitten separately so that they can slowly adapt. .

2. You can also put some items belonging to the new kitten next to the big cat to let the big cat get familiar with the smell first.

3. You can also let the big cat and the new kitten interact and play games to increase their affection.