Puberty is a period of sexual development during which males and females become sexually mature and are able to reproduce. During puberty many body changes occur which includes breast development, widening of the hips, Ovulation starts to occur, the beginning of the menstrual cycle, body hair growth among others. Female babies have 200,000 to 400,000 immature eggs at birth. At puberty, one egg is released per month, About 375 eggs are released in women's reproductive years.