There is no study that shows that rubbing butter makes breasts bigger. If that is your concern, you may consult online reviews like in topbreastenhancement.org.
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Massage your breast, eat foods that help to grow your breast and exercise.
Breast tenderness is caused by hormone level changes from menstruation or pregnancy.
Depends both on the woman and the type of birth control pill she uses.
Actually, natural breast enlargement makes perfect sense if you understand how hormones work.
Do some simple but effective exercises, which will help you strengthen the pectoral muscles by yourself.