This situation in developing kittens should be a sign of a lack of calcium and vitamins in the body. It is recommended that owners buy pet liquid calcium, vitamin A, and vitamin B, and feed the kittens continuously for 1-2 months to absorb the lack of calcium and vitamins in the body. It will improve with supplementation. During the treatment period, the kitten's diet should be strengthened and more nutritious food should be fed to help the kitten's body replenish nutrients.