1. Puberty is the time when female body begins to change from a child’s body into an adult girl’s body. 2. In girls, puberty usually starts between the ages of 9 and 14 years. 3. Physical and emotional changes of puberty begins due to hormonal changes. 4. During Puberty there are changes in breast size, body hair, body shape and size. 5. During Puberty you may experience sudden mood changes due to increasing amount of hormones in the body.