Am 21 year old girl with flat chest then what should do for increase breast?

Nothing - because you can't do anything (apart from getting pregnant of course).

What has to grow is your acceptance of your breasts - cause that's what you would really like. And that is also something you can do. And also, if you have a boyfriend or are going to have one, let him do it for you.


You don't "need" bigger breasts, but you need to be happy about it all.