Definitely. Uneven breast growth is normal. Most breast development begins on one side first, and might continue to be uneven through puberty. Most of the time the difference is not noticeable, but
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Dignified TEENS Foundation - Is it true that girl breasts is of different sizes? Yes, it is true and it is normal. Each of a woman's two breasts grow at different rates.
Perceived Breast Development and Adolescent Girls' Psychological Well-Being