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Puberty (Breast development and growth of pubic hairs ) starts at the age of 9 or 10 and it come to it full growth at the age of 17 18 or 19. But all are not alike and hence the age cannot be taken as stage for a certain size of the breast. Heredity everyday food taken exercise drinking water sleep all these factors affect the growth of every organ of the body.

Okay u know u r starting puberty when u start developing breasts, growing armpit hair, growing hair down there, and also when u r having discharge

Breasts- u will start developing these and usually before u get ur first period u will develops small circles around the bottom of the breasts to push them out and make them more round

Armpit hair- this will begin to grow thin, dark, and silky most likely... When u start shaving it becomes harder and more straight so u have I keep up the shaving

Hair down there- it will grow slowly and over one become more full... It will begin to grow along the edges of your thighs and it will be dark and curly

Discharge- a white/clear stuff that comes out onto ur underwear to clean the vaginal area

Hope this helped(:

Yo sofie Chill. She's growing. You begin puberty when you start developing breast, pubic hair, curves, height, muscles, and of course the most annoying thing but will become your friend (during pregnancy scares) as you turn into a women is your period.

You get your period. DUH!