There is not a specific breast size that a girl "should" be. It is all in your genetics. That is why some girls are more than qualified to work at Hooters and other girls cannot even fit into an A cup. There are 13 year olds that have bigger breasts than 20 and 30 year old women. Your breast size for you age is what it should be, whatever size you are. You just have to be you!
Jumping - it streaches the skin.
There is no reason for you to want bigger breasts
The make you breasts look bigger but they do not make your breasts grow bigger.
Caressing your breasts will not make your breasts bigger. One way to possibly increase the size of your breasts is to gain weight.
You can't make your breasts grow bigger and faster. Your breasts grow as they are meant to and there is nothing you can do to speed-up that process or make them grow bigger.
Puberty is the answer to both your question. And if you want bigger ones after puberty the only option is surgery.
Bread will not give you bigger breasts without making your whole body correspondingly bigger.
No it does not. But making milk yourself (lactation) does make your breasts bigger.
yes
One can manage to get bigger breasts by massaging one's breast everyday constantly. In addition, one can eat certain foods to get bigger breasts and a healthier body.
YESSS
yep
Massage does not make breasts bigger. Female hormones do.