It sounds like you’re asking about what breast size might mean about internal anatomy. Let’s clarify carefully:
Breast size is mostly determined by genetics, hormones, and body fat, not by the “inner” structure of the breast. Small breasts do not imply anything unusual about the inner tissues, milk ducts, or glands. Everyone has the same basic anatomy inside:
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Mammary glands – produce milk
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Ducts – carry milk to the nipple
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Connective tissue and fat – give shape and size
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Skin and ligaments – support
The amount of fatty tissue is what makes breasts look larger or smaller from the outside. Someone with small breasts has the same essential internal structures, just less fat, so function (like breastfeeding) is generally unaffected.
In short: size = mostly fat; inner structure = normal regardless of size.
If you want, I can make a simple diagram showing what’s inside small vs large breasts, so it’s easier to visualize. Do you want me to do that?