Wonder Weeks

Your baby was sleeping great. Suddenly they're fussy, clingy, and refusing naps. You didn't change anything. What happened?

Wonder Weeks says: it's a developmental leap. And they mapped out exactly when each one hits.

Based on decades of research by Dr. Frans Plooij and Dr. Hetty van de Rijt, the app predicts 10 major cognitive leaps from birth to 20 months. You enter your baby's due date (not birth date - important for preemies), and get a personalized calendar. Sunny weeks = smooth sailing. Stormy weeks = brace yourself.

Each leap comes with an explanation of what's happening in your baby's brain, what new skills they're developing, and 77 games to support the new abilities. The community feature connects you with other parents going through the same leap.

Free version gives you the basics. Subscription unlocks full leap details, games, e-books, audiobooks, white noise sounds, and a baby monitor feature. Pricing varies by plan (monthly, quarterly, yearly).

This is NOT a tracker. No feeds, no diapers, no sleep logs. It's a developmental calendar - that's it. Use it alongside Baby Connect or ParentLove for daily tracking, and Huckleberry or Napper for sleep scheduling.

Honestly? The free content on the Wonder Weeks website covers a lot of the same ground. The app's value is the personalized calendar and push notifications warning you before a leap starts. Whether that's worth a subscription depends on how much the "why is my baby like this" anxiety gets to you.

For milestone tracking with exercises, Kinedu covers similar territory with more interactive activities.