{"id":9166,"date":"2025-11-23T15:25:00","date_gmt":"2025-11-23T15:25:00","guid":{"rendered":"https:\/\/www.apadmi.com\/?post_type=work&p=9166"},"modified":"2026-09-23T15:26:17","modified_gmt":"2026-09-23T15:26:17","slug":"the-wonder-weeks","status":"publish","type":"work","link":"https:\/\/www.apadmi.com\/en-nl\/work\/the-wonder-weeks\/","title":{"rendered":"The Wonder Weeks"},"content":{"rendered":"\n\t
\n\t\t
\n\t\n\t\tThe Wonder Weeks\t<\/h1>\n\n\t\n\t\t\t

\n\t\t\tTurning a parenting bestseller into a 5-star subscription app\t\t<\/p>\n\t\n\t<\/div>\t<\/div>\n<\/div>\n\n\n\t

\n\t\t\t<\/div>\n<\/div>\n\n\n\t
\n\t\t
\n\t\n\t\t\t\n\t\t\tA bestselling book in need of a digital equivalent\t\t<\/h2>\n\t\n\t\t\t

\n\t\t\tThe Wonder Weeks is based on the Dutch book Oei, ik groei! <\/em><\/a>by physical anthropologist Hetty van de Rijt and developmental psychologist Frans Plooij.\t\t<\/p>\n\t\n\t\n\t

\n\t\t\n

\n\tThis book is a parenting guide that’s sold more than 2 million copies and been translated into over 20 languages since its original 1992 publication. It helps parents understand why their baby cries, mapping the predictable “leaps” behind a baby’s fussiest phases.

Apadmi’s team in the Netherlands built the earlier versions of the app, which went on to become the best-selling app in its category, rated 4.9 stars<\/strong> from over 109,000 reviews and available in 16 languages.

Off the back of that success, The Wonder Weeks asked Apadmi to build the next iteration: a subscription model, community integration, and cross-platform account sharing, ready for a worldwide release.
<\/p>\n\t<\/div>\n<\/div>\t<\/div>\n<\/div>\n\n\n\t

\n\t\t
\n\t\n\t\t\t\n\t\t\tRebuilt around research, not assumptions\t\t<\/h2>\n\t\n\t\t\t

\n\t\t\tThe redesign started with user research<\/a> and testing, not guesswork.

That research surfaced a clear need: parents wanted certainty when their own experience fell short, and connection with other, more experienced parents to fill the gap. The rebuild was shaped around answering both.\t\t<\/p>\n\t\n\t\n\t

\n\t\t\n\n\tFrom one-off purchase to sustainable subscription<\/h2>\n\n

\n\tThe app moved from a single-purchase model to a subscription, giving The Wonder Weeks more flexible payment options and a foundation to keep growing the business.<\/p>\n\n\n\tOne account for the whole family<\/h2>\n\n

\n\tCross-platform account sharing lets parents, grandparents and nannies alike contribute to the same baby diary, use the monitor features, and draw on the app’s full knowledge base together.<\/p>\n\n\n\tOnboarding tested, not guessed<\/h2>\n\n

\n\tA subscription model lives or dies on a frictionless first impression, so multiple onboarding journeys were tested and continue to be refined through ongoing A\/B testing, with the iOS experience built in close collaboration with Apple.<\/p>\n\t<\/div>\n<\/div>\t<\/div>\n<\/div>\n\n\n\t

\n\t\t