The hair of human beings begins to grow while the embryo is developing. After six months, the foetus is completely covered with so-called lanugo hair.
The embryo loses this fine hair before birth. Then the head and the eyebrows develop strong hair and fine hair grows on the body. During puberty, pubic hair and beard hair start to grow. The speed of hair growth varies according to the hair length and the age of the person. Normally, a hair falls out after six or seven years. Hair colour and form are determined genetically.
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