Answer :
Fat in the connective tissue begins to accumulate when the ovaries begin to make and release (secrete) estrogen. The breasts enlarge as a result of this. The duct network also begins to expand.
The mammary gland is an exocrine organ that secretes milk to sustain the young in humans and other mammals. Mammals get their name from the Latin word mamma, which meaning "breast." The mammary glands are found in the breast of primates (including humans and chimpanzees), the udder of ruminants (such as cows, goats, sheep, and deer), and the dugs of other animals (for example, dogs and cats). Pubic hair and armpit hair also appear the same time as these breast changes.
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