A newborn baby has nipples, areolas, and the beginnings of breast tissue, but most of breast development occurs in two different periods of time in a woman's life: first in puberty , then during pregnancy. Breast development is a vital part of puberty in the human female. Interestingly, humans are the only mammals whose breasts develop before they are needed to serve their biological purpose—breastfeeding. The first stage of breast development begins at about six weeks of fetal development with a thickening called the mammary ridge or the milk line. By six months of development, this ridge extends all the way down to the groin, but then regresses. Solid columns of cells form from each breast bud, with each column becoming a separate sweat gland.
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Lots of girls and guys worry about when their bodies will develop. Guys wonder when their voices will get deeper, when they'll need to shave, or when their penises will grow. Girls want to know when their breasts will develop or when they'll get their first period. If a friend or a younger brother or sister develops first, they may worry that there's something wrong with them. The fact is that physical development starts at different times and progresses at different rates in different people. So, the beginning of the development that comes with puberty varies from person to person — and that's completely normal.
Why wear a bra? No-one needs to wear a bra, but bras protect and support breasts, they help to make you feel comfortable when you are dashing around doing sport, they can help a girl feel good by giving a shape that she likes to her body and they can make a girl feel less self conscious when wearing tee shirts around those 'immature' boys in her class or friendship group. Boys can be such a pain sometimes, twanging bra straps and making silly comments - can't they? So what kind of first bra will you buy? Sports bras are a great first bra because they are comfortable, they don't dig in anywhere and they hold the breast firmly. If you are worried about anything to do with your breasts, the good thing is that every woman knows what it is like to start growing breasts, so you have plenty of people to talk to! If you want to know about the changes in your body then look at our topics on Puberty. We've provided this information to help you to understand important things about staying healthy and happy.
Jump to navigation. Breast development is caused by hormones released by the ovaries at puberty. These hormones cause fat to accumulate, causing your breasts to enlarge. The first sign of breast development is slight swelling under the nipple, a stage of development called breast buds. As your breasts first start to grow, they can be very tender and sore.