Answer :
In humans, pubertal mammary development begins in girls between the ages of 8 and 13.
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).
The mammary glans provide advantage to mammals to nourish their young ones and helped in making mammals most successful groups in the world in term of colonization of natural resources.
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