It's Perfectly Normal: A Book About Changing Bodies, Growing Up, Sex, and Sexual Health by Robie Harris

Harris, R. (1994). It's perfectly normal: A book about changing bodies, growing up, sex, and sexual health.  Cambridge, Mass: Candlewick Press.
This non-fiction book answers questions that children have about birth control, puberty, sex, sexual diseases.  There are six major divisions in the book: What is Sex, Our Bodies, Puberty, Families and Babies, Decisions, and Staying Healthy.  It discusses what happens to our bodies as we mature and grow.  It also discusses the different kinds of love between the different kinds of people. The major strength of this book is that the children are getting accurate information and not from friends and people who do not have the correct information about growing up.