You should first wear a bra when your breasts start to form and come in. This usually happens around middle-high school age, mostly during puberty, maybe earlier. Ask your mom for help with choosing the right one for you.
Some signs that you need a bra are that your breasts are growing, if you notice things changing go ahead and start with a training bra. If your chest or shoulders hurt when you run or participate in gym, you need a bra.
you can wear a bra with out it being noticed by wearin a big jacket
the only way is to tell her or ask her when she first started to wear bras
Training bras are usually purchased early on in puberty when you notice your breasts start growing. The key is if you thinkyou need one, you should get one.
I think it is best to start with a trainer bra when you start seeing your nipples throw your shirt. Anytime after that you should start trying on cup bras and see if anything fits if not try again once you notice change.
you can see your boobs through your shirt and they hurt when you run, ect.
Just say mum I need a bra
There is no need to wear a bra under a sports bra, because sports bra has the function of supporting breast at right position, the key point is that you need to choose a good sports bra.
It is not a good idea really because if a guy notices you for this and then sees you without any stuffing he will get a shock and not look at you again. Just use a bra that gives you comfort and be natural and a guy will notice you for who you are.
when the training bra's start getting too small, or If they have your size in a regular bra.
You need to get a new bra when the old one wears out. If you buy a quality bra, and you clean it properly and alternate days that you wear the bra, a bra can last for years. If you wear it daily or buy a cheaper quality bra, you may replace it in a few months.
You tell when you need a bra when your boobs hurt when you jump or run, and you don't really need a padded bra until your boobs get bigger. Or when you can see your boobs through your shirt.