About The Wonder Weeks

For 30 over years, The Wonder Weeks has been a worldwide bestseller through book and app sales. It gives insights in what goes on in your baby’s head during the magical leaps and how to stimulate this development to get the most out of it. It helps parents understand the real reason behind many of your baby’s crying, eating and restless sleeping behaviors.

Tanzania 1971, where the story of The Wonder Weeks all began … Frans Plooij and his wife Hetty van de Rijt observed chimpanzees with Jane Goodall in Gombe National Park (1971 – 1973). In the years that followed, they came to an important discovery, the occurrence of “regression periods” in chimpanzees, decline in independence. During follow-up research on mother-baby interaction, such regression periods in the first 20 months of a baby’s life became abundantly clear. The leaps had been discovered!