|Other Retailer||Price Checked Time||Their Price in AUD||Our Price|
|Amazon UK||2 days ago||38.4||$21.34||You save $17.06|
About the Authors Frans Plooij, Ph.D., and Xaviera Plas-Plooij are a father-daughter team. Dr. Frans has researched parent-baby interaction for more than 35 years. Xaviera is a Wonder Weeks expert and mother of three. Their child development books, available in 16 languages, have sold more than two million copies worldwide.