Have someone suck on them , its proven they actually get bigger that way.
You don't. Breasts starts to grow in puberty and nothing will be done until that is over. Most 9yo don't have breasts at all and that is normal.
Your body controls the hormones that grow breasts.
I'm in the same situation. But don't worry, they'll grow. If you had your period already, then your breast will grow more :) -Try drinking milk or almond milk. -Posture makes perfect, don't slouch.
Breast development in girls starts between the ages of 7 and 13.
Are you sure about this because a 13 year olds breasts would look like a womans breasts
With the exception of hormone therapy, administered by a doctor, there is nothing that will make breasts grow faster, bigger, rounder, etc etc etc. Stop worrying about it. People grow at different speeds, different ages. One of my daughters had boobs at 13, one at 15.
People grow their breasts at different paces and times. It's different for everyone.