Dear Monique,
Not common but also not uncommon. So long as she has a unilateral breast bud which is not changing or growing and she also doesn't have any pubic or underarm hair or other signs of puberty, it's probably a normal variant. Any changes, bilateral enlargement, pubic hair, vaginal bleeding, acne, or other signs of puberty need to be evaluated.
Take care,
Kate McIntosh MD FAAP
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