A member asked:

How come some girls have their period but do not have breasts?

2 doctors weighed in across 2 answers

Genetics: Secondary sex characteristics like breast development vary in different people in timing and sequence.

Answered 7/23/2012

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Variability: The final breast shape, size and volume varies based on many genetic and some hormonal issues. Some will have oversized structures that lead to back pain and posture problems. Some have the equivalent of a raisin on a pancake. Plastic surgeons make a great living reducing the big ones or adding to the small.

Answered 5/13/2017

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