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.
Age and Cancer Risk
Risk Factors: Age - National Cancer Institute
Breasts can be both a blessing and a curse. And regardless of their size or shape, breasts can change in your 20s and 30s to the point where you may be left stunned, annoyed, or even worried. Of course, there are the usual monthly changes that many of us endure. National Library of Medicine. This means you might have that oh-so-familiar boob pain, on top of all your other PMS symptoms. You might even feel dense, bumpy areas on the outside of your breasts.
How Female Puberty Works
Professional Reference articles are designed for health professionals to use. You may find one of our health articles more useful. See also separate Delayed Puberty and Precocious Puberty articles.
The breast are unlikely to grow after the age of If you gain weight or loose weight the breasts will fluctuate in size. Your breasts are likely not going to grow much more at your age, but remember that things such as pregnancy and breast feeding change the game completely — these cause fluctuations in hormone levels that will likely cause your breasts to change size. Most females have completed their growth in their mid to late teens.