In 1998, Bill Sears, evangelical author, pediatrician, and clinical assistant professor of pediatrics at the Keck School of Medicine of USC, best known as the foremost proponent of attachment parenting, said of the book, "People began calling me about the stuff in this book several years ago, but I basically ignored it, thinking that it was so far out that it would just die out." Sears regretted not speaking out earlier, and said about the book that it was "probably the most dangerous program of teaching about babies and children that I have seen in my 25 years of being a pediatrician."