Is it normal for a cat's tail to fold?

This is normal. It is normal for a cat's ear to be folded, which is true. Their tails will be shorter than normal cats, which is also caused by their own genetic defects. Take good care of them. The so-called "congenital defects" refer to genetic defects that cannot be changed. The specific symptoms of this defect may not be manifested in a period of time, when and how serious it is. The outcome of the disease will not be changed in the future, but you can prolong your health time by learning and feeding chondroitin, and slow down the influence of the disease to some extent.