Describe "the precious child" as the emergence of a cultural norm over the past few decades.?

I have to do a scoailogy paper and the question asked is describe "the precious child", "internsive" mothering, and "involved" fathering and provide the supporting data and evidence for the emergence of these cultural norms over the past several decades. My problem is the book for my cl I lost and the only thing I remember is the intensive mothering and involved fathering. Any one know what type of cultural norm is "the precious child"?