book on how our bodies change, for younger reader (7-10)

[kangamitroo]

i devoured changing bodies, changing lives when my mom gave it to me.  i read the relevant parts, came back later for info as i was ready for it.

i'd love to find something for my dd that will introduce the changes that come with preadolescence, in a safe, healthy way.  i don't want to give her too much too soon.

thanks for any suggestions :)