There’s some decent research in here. The concept of having only one child is a polarizing one (whether it’s a conscious decision or not), and Sandler acknowledges this while laying out the data.

Some reviewers have been quick to label this book as “propaganda,” and while Sandler clearly expresses her bias toward having one child, I think she comes across this way because she is defensive in the beginning—but only to address the stereotypes that exist about only children.

I appreciated the way she lays out the arguments for and against having one child, but ultimately, this is a book for those who have already decided how many children to have. The main conclusion seems to be “only siblings are fine; multiple children are fine,” so it’s not for those who are in the midst of family planning.