Breast development happens in certain stages during a woman's life: first before Stage 4. The areola and nipple become raised and form a second mound.
The four stages of breast development. In Stage 1 shows the flat breasts of childhood. By Stage 2, breast buds are formed as milk ducts and fat tissue develop.
Breast development occurs in distinct stages, first before birth, and again at puberty Stage 4. The areola and nipple become raised and form a second mound.