Are breasts this size because I'm underweight?

Anonymous
I am 18, and only about 160cm so relatively short and I am small build but I am considered 'underweight'. I only weigh around 43kg. My breasts are around a B-C cup, are they this small because I don't have enough weight on me? (If I were at least 10 more kg, would I have bigger breasts)
Are breasts this size because I'm underweight?
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