Girls' bodies are more obviously changes by puberty than boys' bodies. This is because women's bodies have to do much more of the work of sexual reproduction - making babies. Women's bodies will be able to create eggs, carry a fetus, give birth and provide the baby with milk. Men's bodies only need to make and deliver sperm cells.
Puberty and Breasts development
The first sign of puberty in girls is usually the development of breast buds behind the nipples. These will grow to make large glands which can provide milk for a newborn baby. They are also an important part of becoming a woman which can make us nervous or proud about their appearance. Left and right breasts can develop at different speeds - any differences will not be noticeable by the time they have finished growing. Exercises to grow breasts are a myth - but it is good to have well-toned muscles behind the breasts to help support them.
Girls choose to begin to wear a bra at different times - our mothers are probably best for advice on when to start. Wearing a bra early on is thought to help prevent sagging in later life. But some of us are embarrassed to wear a bra with tiny cup size.
Pubic and Armpit Hair
Puberty causes both boys and girls to begin to grow hair in new places. This hair is thicker and tougher than the soft "fluff" we had up until puberty. Public hair grows around the pubic bone and the vagina. Underarm hair also begins to grow.