Everything a new parent needs to know about their baby’s 10 magical “leaps”―and when to expect them―in a new, modern sixth edition of The Wonder Weeks

The Wonder Weeks answers the question, “Why is my baby cranky, clingy, and crying?” with helpful guidance. Maybe they’re experiencing a leap in brain development, after which new skills are mastered, discoveries are made, and perceptions evolve. Fussy behavior might signal that great progress is underway!

Better yet, these phases occur on similar schedules for most babies―as explained and mapped out in this book―so parents can anticipate the “stormy weeks” that precede the “sunny weeks.” Based on decades of research, this fully revised sixth edition covers the first 20 months of a baby’s life and includes:

The top 10 things to know and remember about a leap
Fun games to support brain development
Fill-in-the-blank checklists to help better understand personality and behavior traits
Science-based explanations about sleep
Fresh insight and recent commentary from new parents who’ve used The Wonder Weeks
Anchor moments to keep new parents sane, especially when they are exhausted and discouraged

With 2 million+ books sold, and 4 million+ downloads of the corresponding app, The Wonder Weeks has struck a chord. Join the phenomenon that has been embraced by celebrities, social media influencers, and parents worldwide.

Black & white illustrations throughout

About the Authors

Xaviera Plooij is a mother of three and the best-selling author and CEO of The Wonder Weeks brand. She lives with her children in the Netherlands.

Frans X. Plooij, PhD, has been conducting research in the field of psychology for close to 50 years. Highlights include working alongside his wife, Dr. van de Rijt, with Dr. Jane Goodall on infant development in free-living chimpanzees in the Gombe National Park; leading the department of Research and Development at the institute for Child Studies of the City of Amsterdam; and currently presiding over the International Research Institute on Infant Studies (IRIS) at Arnhem, the Netherlands. He is a full member of several international scientific societies in the domains of child development and behavioral biology and of the New York Academy of Sciences.

The late Hetty van de Rijt received her PhD at Cambridge University as a physical anthropologist. With her husband, Dr. Plooij, she studied infant development in free-living chimpanzees with Dr. Jane Goodall in the Gombe National Park. As a researcher at the University of Amsterdam, she studied the development of human babies in their home environment through direct observations, filming, and in-depth interviews with their parents.

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