Puberty is the time in life when your body starts to make the change from being a child to becoming an adult. That means that your body is able to become pregnant or cause a pregnancy. Of course, just because your body is physically able to make or carry a child doesn’t mean you are mature enough to be a parent.
Puberty is a normal period of human development that everybody goes through at their own pace. It happens because of natural changes in hormones (naturally occurring chemicals) in your body; and doesn’t happen overnight.