If you're female, wearing a sports bra usually decreases sensitivity. It works just like an immobalizer for a broken leg. If you're male, the same thing probably goes, just be careful with your pride.
You should either wear a bra once your breasts are large enough to be pulled down by gravity, or choose not to wear a bra and have breasts down to your waistband when you get 20 years older.
When a girl should wear a bra is not based on a certain age. She should wear a bra when her breasts start showing.
When their breasts need support.
a bra.
No! I'm a guy. But seriously, girls at their puberty age should always wear a bra, so that their breasts got a support. Latter on, it will be your choice. Generally girls with small breast often don't wear a bra. Women with bigger breasts, always wear a bra to support their breasts, and because it looks better.
Bra's are uncomfortable. If you want your breasts to protrude, sure you can wear a bra. It would be more manly to buy an elastic bandage and wrap your breasts.
A girl should wear a bra to support her breasts. As they are developing and especially after they develop, the breasts should be developed. It can hurt to run and have them bounce, so many girls prefer a sports bra when doing physical activites. Also, it helps to keep them supported and padded so that they are less sore and don't get bruised. Breasts are sensitive and, like any other muscle, can bruise or get sore very easily. A bra helps create a nicer shape under clothes, as well as makes it more comfortable to wear clothes and to move about during the day, too. you don't need to wear a bra
When the breast tissue can be seen through clothing, most girls would like a bra. If the breasts have begun to jiggle when you walk/run or participate in sports - it's time. A bra is also needed if there is pain or uncomfortable movement of the breasts. If you ride a bicycle and hitting bumps causes your breasts to hurt, or you have breast pain while playing sports, then you should wear a bra. A sports bra is good to wear when you are active. The breasts are often sensitive during the first couple of Tanner stages of development, so a bra will help minimize movement and help reduce discomfort while they are growing.
bra
Wear a bra.
No it depends when she start developing breasts
Yes, a female freshman in high school or college should wear a bra because by this time, the normal female body would have developed breasts.