My older brother has Down Syndrome and the late '70s/early '80s were a cultural shift in which people started actually bringing their disabled children home and not institutionalizing them. So, our family dealt with a heck of a lot of ignorance and I'll leave it at that. (Frankly, some things are better now and a lot still aren't.) Because my brother was older, I was aware, he was different, but it was difficult to understand why. This book does an excellent job explaining exactly what Down Syndrome is and what it means. I disagree with the statement that one page is too difficult for children. I remember my mom reading it to me at age three or four and it helped things make more sense. Yes, it talks about chromosomes and genetics, but frankly, you can't get around an honest conversation of what DS is without discussing those things and this is the sort of book that ought to be accompanied by a conversation. My mom just explained that chromosomes are what make you, you, and that's a pretty good explanation for a child. I was probably the only four-year-old I knew who knew that word and had a sense of what it meant.
But I remember reading this book over and over again as a kid. It made my family seem more normal that there were other families like ours out there. I appreciate and highly recommend this book, especially to families with non-disabled siblings.