Hormones that have lain dormant within the body awaken when a person reaches their pubescent age, causing many changes within the person, including the growth of pubic hair. It is quite natural for puberty for girls and boys to grow pubic hair in their puberty. Everyone is different in terms of quantity of hair that grows, the rate of growth, and at what age a person starts puberty. When a girl goes through puberty, hair growth in the pubic area is often the first physical sign of change. Pubic hair will first be soft and only grow in small quantities, usually beginning between the legs.