Simone Cave is a mother of three children and the co-author of several parenting books including Your Baby Week by Week, Potty Training Boys and Potty Training Girls. She was the Health Editor on the Daily Mirror for eight years and now works freelance, writing for national newspapers and magazines.

Dr Caroline Fertleman is Consultant Paediatrician at The Whittington Hospital, London, Honorary Senior Lecturer at University College London Medical School, and Consultant in Medical Education at the Institute of Child Health. She has co-authored several parenting books and is also a mother of three children.

 Introduction • New Baby - Birth to six months • Older Baby - Six to twelve months • Toddler - Twelve to twenty-four months • Development Time Line • Resources.