The standard work - completely revised and expanded. With a million copies sold in German-speaking countries and the associated No. 1 app, "Oh No, I’m Growing!" is one of the most successful parenting guides. Renowned developmental psychologists Dr. Hetty van de Rijt and Dr. Frans X. Plooij discovered that every baby goes through ten major leaps in mental development during the first 20 months, and that these exciting yet often perceived as crisis periods of growth always follow the same rhythm. With this knowledge, they have helped countless parents. Xaviera Plas-Plooij, the daughter of Hetty van de Rijt and Frans X. Plooij, has now completely revised and expanded "Oh No, I’m Growing!" together with her father. For the first time, the authors share insights on the number one parenting topic: how babies sleep. Additionally, the new edition includes many more interactive elements such as discovery lists, exercises, and a personal leap calendar to fill out. This way, parents can explore the world through their baby's eyes and get to know them much better. For the best start to a happy life.