To be recorded in kilograms. Average birth weight is 2.5 to 3.0 kgs. This increases roughly at the rate of 0.5 kgs per month during the first year. Doubles the birth weight at the end of five months. Four times the birth weight at the end of two years.
Testes become large and firmer Penis begins to enlarge.
Voice becomes hoarse. Onset of menarche between the age 12 to 14 years. Breast begins to develop between the age 13 to 14 years. Fine hairs appear on mons veneris and labia develop. Wrinkling of skin around eyes.