Girls don't have to wear Bras - many girls do because they feel more comfortable, girls with larger breasts may need the additional support, but no one HAS to wear bras if they don't want to.
When a girl should wear a bra is not based on a certain age. She should wear a bra when her breasts start showing.
I would say no.. But it is better to start wearing a bra when you have started to grow breasts...
your boobs may start to sag and then when your alot older they will be really saggy
girls wear bras to support their brests. you don't none but most people choose to, it looks best also girls start wearing a training bra when the nipple first starts to show and get larger
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A girl should get a bra when her breasts start to develop. When other girls start to wear bras or when she notices her chest changing she should start with a training bra, and when she needs more support she should consider other bras.
One cannot determine when to start wearing a real bra by the girls age, it all depends on weather you need it or not, but usually girls start to wearing training bras/ crop tops underneath their shirts when they are 10-12 years of age, then you start to wear a normal bra when you feel that you need one.
Depending on the size of your breasts, most girls start at around 12 to 13.
Not usually, only if there is a built in bra.