One of the basic characteristics of life is reproduction. Like other mammals, humans are born with bodies that are not able to reproduce straight away. Babies and children need to grow, learn, and form loving relationships with their families. The bodies of young boys and girls are very similar in shape. Then comes the time to develop into sexually mature individuals, capable of having sexual relationships and perhaps, in time, children of their own. This section answers the most common questions about puberty. Pic of boy to man and girl to women