Leaps in the mental development of a baby

Dr. Hetty van de Rijt and Dr. Frans X. Plooij have spent 35 years researching parent-baby interaction and they have made perhaps one of the most important discoveries in the world of baby development. The research has shown that babies make 10 major age-related changes – leaps – during the first 20 months of life. With each leap comes a drastic change in a baby’s mental development. They learn so much at once that it all becomes too much for them.

During these leaps, a baby cries more, is more clingy and cranky, sleeps worse (or hardly at all) and eats less. But this fussy phase is actually very positive: your baby is learning!

Millions of parents have learned about their baby’s mental development with The Wonder Weeks!

  • The 10 mental leaps with tips, tricks and mindblowing insights from experts
  • A unique personalized leap chart shows when a leap starts and ends
  • An overview of your baby’s most important milestones per leap
  • An entire chapter on your baby’s sleep behavior during the leaps and what you can do to improve its sleep behavior
  • How to give your baby the help he or she needs during the different stages of a leap
  • How to stimulate your baby in his/her new skills
  • Lets you experience the magical world through your baby’s eyes

With The Wonder Weeks you can make the right decisions for you and your baby!

Download The Wonder Weeks app

Would you like to have all the information about your baby’s development at your fingertips and look back at all the special moments? Then download The Wonder Weeks app now.


The Wonder Weeks Sleep App - Available on AppleStore The Wonder Weeks Sleep App - Available on Google Play