It is suggested that it is best to take the baby to do a micro-test and slowly help the child change this habit. It may be that the child is lonely and insecure. Usually, parents will play with the child to eliminate the baby's loneliness.

Suggestion: Biting fingernails is related to habits and lack of trace elements. Measure trace elements and supplement them according to the missing elements. Check for zinc deficiency!

How old is the child?