There could be a number of causes for this to happen. Low levels of Testosterone would be the first thing to check.
Somatropin is the hormone associated with growth.
Testosterone, the male hormone.
estrogen
Testostrone is a hormone that causes secondary sex characteristics in males and sperm production.
During puberty, the main hormone responsible for the changes is called gonadotropin-releasing hormone (GnRH). This hormone triggers the release of luteinizing hormone (LH) and follicle-stimulating hormone (FSH) from the pituitary gland, which in turn stimulate the growth and maturation of sex organs and the development of secondary sexual characteristics.
estorgen
The hormone responsible for most men to grow facial hair is testosterone. During puberty, increased levels of testosterone stimulate the growth of facial hair, along with other secondary sexual characteristics.
Estrogen
It's part of your genetic makeup. And also has to do with hormonal levels, particularly oestrogen, which is involved in the development of secondary female sexual characteristics (breasts, shape of hip etc).
Adrenal
The development of secondary sex characteristics (for example, breasts in females and facial hair in males) causes girls to look like women and boys to look like men.
Cretinism is primarily caused by a deficiency in thyroid hormone, particularly during fetal development or early childhood. The lack of thyroid hormone can lead to stunted physical and mental development.
luteinizing hormone