Normal growth is controlled initially by growth hormones and thyroid but during puberty, a third factor comes into the consideration which is sex hormones. In males, between the age of 10 to 13 puberty begins and lasts till 16 to 18 years of age while in girls puberty starts at around 11 to Twelve years of age and lasts till 16 to 17.

During this period of puberty, the growth of body is controlled by the sex hormones and the normal body growth becomes very slow because the sex hormones tend to emphasize more on reproductive tissues then rest of body.