As her breasts start to grow, a girl Puberty development girls initially have small, firm, tender lumps called buds under one or both nipples; the breast tissue will get larger and become less firm in texture over the next year or two. Ejaculation — the release of sperm-containing semen — will also occur. She may be very close to starting and your doctor may recommend a little longer observation, or may want to do some testing. I haven't been sensitive to that but Puberty development girls I can better understand some of her new emotions!! I'm 15 and no signs of puberty, not even hair!