Breast development happens in certain stages during a woman's life: first before birth, again at puberty, and later during the childbearing years. This starts with a thickening in the chest area called the mammary ridge or milk line.
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It can be a very interesting time in a guy's life, what with all the changes going on. Other common places for stretch marks are on the hips and thighs. No other signs of anything unusual turned up in the exam. Even if your development is normal, it can be hard if you seem to be either the first or the last one among your classmates or friends to develop breasts.
What is normal breast development?
When this happens, one or more tiny red bumps appear. As your adolescent begins to struggle for independence and control, many changes may occur.