This book provided me with all the answers I needed for those who said "You can't have just one child," and "He needs a playmate." Ok, my, then I'll get him a dog, response is not in here.. But better ones, ones for yourselves, about all the real benefits of being an only child, from better cognitive skills to assurances that your child will be able to make friends and won't necessarily be spoiled unless you spoil him or her (and how to be sure you don't). Some of the "evidence" was not documented well enough for me (maybe parents with better cognitive skills tend to have only one child, later in life?) but all in all it has good advice, good information and helps you and your spouse feel good about the family you have chosen to make.
This book is great if you have any worries that having an only child will be a problem for them or you. Good scientifically backed evidence that only children are happy and well-balanced, and don't have to be the precocious brat that people expect. Really helpful practical advice and very readable. Fabulous book.