The possible clinical reasons for children’s failure to grow nails include bad habits, lack of nutrients, hypothyroidism and so on. 1. Bad habits: children have gnawing nails, touching unhygienic things with their hands and other bad habits, which may cause difficulties in nail growth. 2. Lack of nutrients: the main component of nails is protein, and vitamin A has the role of promoting growth, maintaining bone development, etc. When the child’s body lacks protein, vitamin A and other nutrients, the growth of nails may be affected. 3. Hypothyroidism: The overall growth and development of children with this disease is in a relatively slow state, because the body lacks the thyroid hormones needed for growth and development, and thus the growth of the nails will also be affected. Children do not grow nails, there may be other reasons, it is recommended to go to the hospital in time, complete the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.