In girls, it is the ovaries that produce the main female sex hormones that stimulate breast development, rapid growth, and menstruation.
In boys, it is the testes that produce the male hormones, causing the formation of muscles in the body, pubic and underarm hair, and spontaneous ejaculations.
The female sex hormone (estrogen) generates increased bone growth velocity and closure of the epiphyseal growth plate (epiphyseal fusion), which causes both girls and boys to stop growing. The estrogen hormone is produced by the ovaries and also by fat cells. In the case of boys, if the male hormone (testosterone) is being produced in excess by the testes, this can stimulate the conversion of testosterone to estrogen, causing breast swelling or enlargement and, finally, causing the child to stop growing taller.
For example, In families where the parents are somewhat on the shorter side, if your daughter of seven to eight years old is rather plump or overweight and appears to be growing taller more rapidly than usual, don’t rejoice too quickly, but rather take steps to make an appointment with a doctor as soon as possible in order to correctly diagnose the cause. If a child is going through precocious puberty, then not only will they grow faster than usual; they will also stop growing faster than usual, as well.