The Care and Keeping of You (The American Girl book). These people know their market! This book is known and loved by a gazillion people.
There’s also a “Part Two” version for older girls.
This one was recommended to me as a more inclusive puberty book for girls:
And for boys, I like this one but FYI it does refer to boys developing an interest “in girls” (ie, it is heteronormative.)
And if you want a book that offers some information about puberty plus reproduction and other sex-related topics, this is always my favorite for kids 7 (ish) and above:
And for kids in 6th grade (ish) and above:
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