Definitely take with a grain (or a ton) of salt
Verrier focuses on the biological tie between child and birthmother to a positively mystical extent, making some very dubious and scientifically-unsupported claims in the process. It's certainly vital to raise people's awareness that adoption is never problem-free, and that it's impossible (as well as unethical) to try to cut a child off from their past, but to do so through a glorification of some primal pre-natal "bonding" is unhelpful to say the least. I found the book woolly, annoying, and at times positively deranged.