1. Ages 8-11
There are few outside signs of development; but inside, ovaries are enlarging and hormone production has started. The preadolescent breast consists of a small, elevated nipple with no significant underlying breast tissue.

2. Ages 8-14 (usually 11-12)
Breast bud stage; elevation of the breast and nipple as a separate small mound; the areola (the area around the nipple) begins to enlarge, and milk ducts inside the breast begin to grow. Girls may grow considerable in height and weight. The first signs of pubic hair start out fine & straight.

3. Ages 9-15 (usually 12-13)
Pubic hair coarsens and becomes darker. A girl's vagina is enlarging and may begin to produce a clear or whitish discharge. Some girls get their first menstrual periods. Enlargement and elevation of the breast and areola (less separation), the areola begins to darken in color, and the milk glands begin to grow.

4. Ages 10-16 (usually13-14)
Pubic hair growth takes on a triangular, but doesn't quite cover the entire pubic area. Underarm hair may begin to appear. Projection of the areola and nipple to form a secondary mound. Ovulation (the release of egg cells) begins in some girls.

5. Ages 12-19 (usually 15)
The final stage of development, breast and pubic hair growth are complete, and your full height is usually attained at this point. Menstrual periods are established, and ovulation occurs monthly. Mature adult breast, projection of the nipple.

For stages of Breast Development please visit http://www.myfirstbra.us/breast_development.htm.