What does the oestrogen do at puberty?

•The marked changes in the body and in the way we behave at puberty are entirely due to hormones.

•the ovaries in the female become active, and secrete testosterone or oestrogens respectively. These hormones are mostly responsible for young people developing from children into young adults.

•Puberty is a time of great change. Not only does the body alter from a child-like shape to a more adult one, but things like friendships, attitudes to others (of both sexes) and to one's parents all change quite dramatically.

•Hormones also get blamed for lots of other things around puberty - mostly bad things, like acne, moodiness, tiredness, bad temper, greasy hair, sleeping a lot.