Genetics.
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They are big because you have developed faster than most girls, some girls develop breasts and period till they reach 14-15, but you devoloped faster :) its natural, oh you are very lucky to develop so fast and the boys too
It was just how you were made. Some women do get larger breasts when they gain weight.
Beer cause of hop, and cow meat or milk cause nowadays there injecting more hormones into cows to increase production..and those hormones well increase your boob size
there s a lot I'm just going to cover the most com-men ones if your pregnant , if your fat ,if you have a hormone in balance
They grow and develop as you go through Puberty so you can suckle your infant when you become a mother.
Breasts in adult female are bigger than those of adult male to make and supply milk to the newborn. It contains mammary glands, lactiferous tubules and ducts.