My son just turned 10 and I want him to be prepared (he sees his 11 year old sister "changing" and he's interested in when his own puberty will start) and has been watching for his own new hair growth. We needed a book that addressed his interest and possible concerns about what puberty was and what to expect for himself.
This book fit the bill exactly! It has very accessible text, nice color illustrations that don't overdo the "cute" factor that some illustrations attempt. Topics covered were what I wanted him to know about and I approved of the straight forward but not over-the-top approach to how much information was presented for this age group.
This isn't a text that tries to impose the author's own morals or ethics, but merely impart important information to children on the cusp of puberty (or already there) and let them know that the changes (emotional and physical) and feelings are normal and who to talk to about when they're not sure.
I also very much appreciated that the last section of the book addresses what's going on with girls at the same (or not) time.
Just the right amount of text and length for the age and topic when you're moving from a basic book on the "birds and the bees" to more specific information aimed at the child himself and his body and feelings. I also appreciated that the author addresses the changing hygiene needs of the child.
My husband decided to read it aloud to our son the first time through, so he could ask questions and they could talk about my husband's own experiences in puberty. Now he can have it to read at his own pace and what topic is interesting to him at the moment.
We purchased the same book, but for girls for our daughter, to use in addition to the excellent one by American Girl that the previous review mentions. My daughter loves that book and I've looked for a long time for one like it for boys. This is it! I don't think you can go wrong if you're looking for an open, accessible and just the right length book to get the discussion rolling at your house.