Does not wearing a bra increase size?

Online Answer
That's because genes and hormones control breast growth, not what a girl wears. Bras don't make breasts grow or stop growing, but wearing the right-size bra may help you feel more comfortable. Bras that are too small may cause breast pain because of how sensitive some girls' breasts can be as they grow..
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Not much research In his research, he concluded bras provide no benefits to women and might actually be harmful to breasts over time. Rouillon said his study involving 300 women ages 18 to 35 showed that women who did not wear bras developed more muscle tissue to provide natural support.