The Wonder Weeks
Understand why your baby cries
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The #1 baby app worldwide! Understand why & when your baby suddenly cries more than usual, is not themselves and… what you can do to help.

Your baby is suddenly crying all the time, clinging to you, and you ask yourself what is wrong. The good news is that this fussy crying phase is a sign of progress in the brain!

Millions of parents have gone before you in following, supporting, and encouraging the 10 leaps in the mental development of their baby or babies. It is with good reason that Apple has declared it to be in the top 10 of the “Best sold apps in 2018, 2019 & 2020”

- Learn all about the 10 mental leaps with tips, tricks & mind-blowing insights.
- Your unique personalized leap schedule shows when a leap starts and ends, and… it counts down for you.
- Discover how you can give your baby the help they need during the various stages of a leap.
- Know when you can expect new skills.
- Keep track of your baby’s development and milestones in the diary.
- Gain insight into your baby’s perception of the world.
- Experience the world through your baby’s eyes.

- Over 350 extra milestones to keep track of in your diary
- Baby monitor: Wi-Fi 4G (INCLUDING 7 chapters on sleep from the book)
- E-Book (in full or per chapter)
- Audiobook (in full or per chapter)
- Music to lull your baby to sleep (white noise & music)

- Declared by Apple to be in the top 10 “Best sold apps in 2018, 2019 & 2020”
- Most downloaded paid app in Health and Fitness
- Award for “Coolest App for Moms”
- “Choice & Gold” Award from users, MumIi
- AppRx Awards Top 10 “Children’s Health App”
- NHS (UK) – “Best App for Parents”

Especially for parenthood. The baby tracker for your baby’s leaps in their mental development. You can keep track of your baby’s milestones and your baby’s growth in our The Wonder Weeks! baby tracker. A leap for you and your baby.


Disclaimer: This app has been developed with the greatest of care. However, neither the developer, nor the author is liable for any damage caused by inaccuracies or incompleteness of the app.
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The Wonder Weeks
eBook - Chapter 1
eBook - Chapter 2
eBook - Chapter 3
eBook - Chapter 4
eBook - Chapter 5
eBook - Chapter 6
eBook - Chapter 9
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User Rating

4.86 out of 5

110,060 ratings in United States

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Ratings History


Great app!

MrsYanczak on

I used it with my first 6 years ago and now using it with my second. I love this app. It truly helps you understand what’s going on with your baby and gives great advice.

Worth it

Deleo7 on

Worth the money, it has enough information for any parent to learn something new and an easy interface to pick up on with a busy schedule

Absolutely amazing!

Mkin1112 on

I absolutely love it! It has been so accurate and helpful. I love the game suggestions and just the amount of detail into everything. Being able to also kind of visualize and put yourself in your babies perspective and relate to what your baby is experiencing is a cool feature also. It definitely has been worth every single cent that it cost.


mckilla3 on

I believe this is one of the greater apps for first time parents to help and understand your babies leaps and skills and to be active with your baby with some helpful tips!! Its also a journal to save for future to see how much your baby progressed in the weeks and to see how far they come along and it’s amazing :)

Great info, timing slightly off

akcollins28 on

My baby was born six weeks early. I know they say to go off of the due date for these leaps, but I feel like my baby is slightly ahead of the timing. So my advice when using the app is to use the great information about the leaps, but I wouldn’t rely super heavily on the time frame. Personally I would subtract maybe 6-9 days from ours to fit his behavior. I love the games for him and the information about each leap though! It’s so helpful to learn what he is experiencing.

Life Saver!

Kelli Kinderdine on

I thought I was going crazy when my daughter started getting extra fussy, seemingly out of nowhere. I went searching to see what I could do to help and found this app! Normally I am not one to pay for an app but I was desperate - and I’m so glad I did!! Wonder Weeks explained that my daughter was in the fussy phase of a leap. This gave me peace of mind knowing that it wasn’t something I was doing wrong. Plus, it gives you fast information about what they learn in each leap! I love the activity suggestions too - they give me an idea of how to continue to develop the new skills my daughter is gaining. Highly recommend!

2nd time Mom

LTcan123 on

I have been using this app since my first born and now using it for our new baby. It’s gotten better since 2020 and it’s probably one of the best apps I’ve ever downloaded. You can’t beat the price point and being able to keep it and use it time and time again with every kid has been great value.

Wonder weeks for first time mom

thirdeyedawg on

Very useful and helpful when it comes to tips on what to do with baby and how to keep you and baby active

Wonderful Amazing App!

Angy LM on

I really recommend this app to any moms out there! I am a first time mom and this app has really helped me discover my baby and some reasoning to her behaviors!

Unwilling but not mad about it

TxMe on

I used it frequently when my son was first born, it wasn’t really my choice to use the app. A family member raved about it and made me buy it. I only really use it when I notice he gets fussy and check to see if it’s a fussy stage. I don’t worry too much about his growth or targets, because babies are so different. I just personally don’t use it all the time, I’d rather be in the moment than worrying if he is or isn’t hitting the milestones.

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App Info

Domus Technica BV
English, Arabic, Danish, Dutch, French, German, Indonesian, Italian, Japanese, Korean, Portuguese, Russian, Chinese, Spanish, Swedish, Turkish
Recent version
12.0.5 (4 weeks ago )
Released on
May 30, 2012 (12 years ago )
Last updated
6 days ago