The Wonder Weeks worldwide bestselling baby app is a personalized weekly calendar of your baby’s mental development that will keep you informed about the leaps and bounds and the fussy phases of your baby.

- Keep track of your baby’s mental development
- Learn all about the leaps and bounds and the fussy phases of your baby
- Read the bestselling Wonder Weeks book here in this app
- Take notes about a range of topics in a comprehensive diary
- The leap-alarm service
- The calendar sync option to show the leaps in your agenda

- A full HD 4G / WIFI baby monitor
- The complete Audiobook of the Wonder Weeks (English)
- The compete eBook of the Wonder Weeks in several languages
- a proven white noise library to help you baby doze of
- a proven library of classical music and sounds to help you baby relax
- Extra content such as over 400 milestones and over 200 games and activities.

International experts on The Wonder Weeks:
 “This is a very practical and entertaining window into the baby’s first year and a half. van de Rijt and Plooij have observed and found the vulnerable times in an infant’s development that I independently came to in my research. The authors’ observations and practical suggestions are wonderful.”
 -T. Berry Brazelton, M.D., professor emeritus, Harvard Medical School

"Anyone who deals with infants and young children will want to read The Wonder Weeks. This book will open parents' eyes to aspects of their children's growth, development, changing behavior, and emotional responsiveness that they might otherwise not notice or find puzzling and distressing."
 -Catherine Snow, Ph.D., Shattuck Professor of Education, Harvard Graduate School of Education

This App is developed with the greatest care. Neither the developer nor the author shall nevertheless be liable for any damages arising from any inaccuracies or omissions in this app.

What’s New

Version 9.1

Minor improvement

Ratings and Reviews

4.9 out of 5
23.3K Ratings

23.3K Ratings

L-Mittens ,

Old fashioned interface and hard to use

Heard quite a bit about this app from my fellow NCT Mums and downloaded it. Had to double check it was the correct app because even the screen grabs of it in the App Store show it to look really dated and old fashioned in terms of design. I purchased it nevertheless and have to say that unfortunately I am not impressed. It’s really difficult to navigate and for something that should be really simple and intuitive (ie a calendar feature that then links through to information about what your baby should be experiencing at that time plus data on how long it is til the next leap) it just didn’t deliver on this. Also the content itself is not written very well (whose decision was it to write it in the baby’s first person rather than he/she’ ?! It’s not as if the baby would be reading this!) The calendar feature isn’t clickable and doesn’t tell you what the icons mean or click through to the corresponding info page. I can’t really see how this app is very useful to be honest and in an age with some many brilliantly designed and well-tested apps I think this needs a completely redesign and a lot of user feedback taken into consideration. Take heed app designers.....

Developer Response ,

Hi, we appreciate your feedback but have to make some corrections.
The Leap chart is indeed static in terms of not being able to add information to it, and there is a reason for that. It is a simple indicator when the vast majority of kids hit leaps, give or take a day or two. You will find the legend explaining the chart icons under the chart.
The app also contains the Calendar integration feature, which creates entries in your default calendar to remind you when the next leap will occur. For additional info, please contact so we could reach out. Regards, Marco

Selena GA ,

Great app but experiencing problems since the update

I’ve loved using this app - it’s been invaluable for my husband and I to be able to predict and therefore attend more consciously to our sons leaps. It’s been pretty spot on for us in terms of when certain behaviour is predicated. I used to find it very easy to use.

Since the recent update however the layout has changed, it asks me for language choice every time I open it, there’s new list features- which I don’t find particularly useful and there seems to be problems now with the app- the calendar view isn’t accurate (the dates/week don’t align properly), the videos do not load and the information and usability isn’t as clear. I’ve tried deleting the app and re downloading but the same problems persist.

I’ve tried to find a way of contacting someone to help but can’t find a way to do that. Anyone else having such issues?

Developer Response ,

Hi, as for the issue you mention, we are working on resolving it for our next update. There is a workaround for now: Select a different language. Then select back to the preferred language. And click on "Done". Now the app will save the selected Language. We are working on an update as I mentioned. Your other complaints were noted and we will also be considering them for future versions. Regards, Marco

Ayqz2 ,

No white noise or music!

I already have the book and decided to get the app because the book said that there are scientifically proven white noise tracks and music on the app. But it turns out you have to pay a hefty monthly fee to get and maintain access to these. The app description simply lists these features as 'extras', with no indication that you have to pay a subscription for them. So I really don't need the app because it offers nothing more than the book (except a diary to fill in for sleep, milestones tracking etc which other apps are much better for due to better UI etc). It turns out that I have to buy the separate 'Wonder Weeks Sleep' app for the white noise and music library - but I've already bought this one and feel cheated to be honest! Especially since I already paid for the book. Developers, please be more transparent in your description and don't waste people's (aka sleep-deprived parents') time and money!

Developer Response ,

Hi, thank you for your feedback. We will look into revising app description provided at the store. We offer in-app purchases for those extra features such as baby monitor since we cannot offer them at the same price range as for the app. Regards, Marco


Domus Technica BV
193.6 MB

Requires iOS 11.0 or later. Compatible with iPhone, iPad and iPod touch.


English, Danish, Dutch, French, German, Indonesian, Italian, Japanese, Portuguese, Russian, Simplified Chinese, Spanish, Swedish, Turkish

Age Rating
Unrestricted Web Access
In-App Purchases
  1. Chapter eBook, Leap 1 £0.99
  2. Chapter eBook, Leap 2 £0.99
  3. Chapter eBook, Leap 3 £0.99


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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