Very interesting book. Will check it out for sure.
I have a 4.5 yrs old who can understand 4 languages and converse in three of them. Credit goes to my wife for conversing with him like an adult in all these languages. I don't know why, but we never did any baby talk with him, and based on his teachers' comments he is way ahead of his peers in language/communication skills.
My wife started teaching him reading English about 3 months ago. Now he can practically read at 2nd grade level. We don't push him to read, but he loves reading his story books. I hope your book offers couple of more things that we can try to increase my kid's happiness.