It is not normal for a five-year-old girl to grow a beard, which may be caused by an imbalance of hormone secretion in the body, and it is recommended to go to a regular hospital for a clear diagnosis. The beard belongs to the secondary sex characteristics, usually after entering puberty, the child is only five years old and is still a girl, under normal circumstances, should not appear long beard. The five-year-old baby girl long beard, is likely to be related to genetics, disease, drugs and other factors. For five-year-old girls, if their parents have heavy sweat hair or their mother also has a beard, it is likely to be caused by heredity. If the parents do not have such symptoms, they need to go for endocrine examination to observe whether it is a disorder of the endocrine system, such as excessive secretion of androgens, and timely treatment accordingly. In conclusion, it is usually abnormal for a five-year-old baby girl to grow a beard, and if heredity is ruled out, it is recommended to actively treat the original disease.