Everyone’s perception is more beautiful if they know they’re understood. This also applies, perhaps even more so, to babies. With our knowledge, we hope to show you the perception of your baby so that you know what is going on inside their little head and that they feel understood and appreciated. It provides your baby with the opportunity to develop in their own special way and to reach their true potential. It’s the foundation of a smart start for a happy beginning.

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Why all baby’s go through fussy phases

It’s not your imagination– all babies go through a difficult period around the same age. Research has shown that babies make 10 major, predictable, age-linked changes – or leaps – during their first 20 months of their lives. During this time, they will learn more than in any other time. With each leap comes a drastic change in your baby’s mental development, which affects not only his mood, but also his health, intelligence, sleeping patterns and the “three C’s” (crying, clinging and crankiness).

Crying, Clingy, Cranky: signs of progress!

Babies cry during a leap because they’ve reached a radical new step in their mental development. That is good: it gives them the opportunity to learn new things. The “difficult” behavior is actually a signal that great progress is underway.

Like the physical growth spurts that a child makes, the mental development of children is also made with leaps. Neurological research has shown that such leaps are accompanied by changes in the brain.


Although the leap phenomenon is as old as man kind, it is not until the research of Dr Hetty van de Rijt and Dr. Frans Plooij that we parents knew exactly what to expect and when. This sanity saving research is now available for parents in means of books and apps.

The Wonder Weeks gives you…
A Smart Start for a Happy Beginning!

The Wonder Weeks

Explains exactly:

  • when your baby is taking a leap
  • how to help your baby through the leap
  • how your baby perceives the ‘new’ world
  • how to make the most of this leap
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