The Wonder Weeks (TTW) V.8 — Android App Redesign

Revitalising a top Health & Fitness App for Enhanced User Experience

The Brief

The Wonder Weeks app has earned a place among the top 5 health and fitness apps in 16 countries and is a condensed version of the award-winning Dutch book Oei, ik groei!

Historically, business stakeholders handled UI updates internally, focusing on incremental visual changes. However, with growing user demand and increasing workload, the company brought in an industry professional for the first time in 2019 to lead a creative overhaul, with a stronger focus on user-centred design based on feedback and data insights.

The Solution

Prioritising Android

While previous designs primarily focused on iOS, this redesign prioritised the Android platform to address its growing user base.

Collaborative Approach

• Partnered with 4net Interactive (Netherlands) to translate user needs into low-fidelity wireframes.
• Worked closely with a development team in Bosnia to implement independent, visually refined designs.
• Monitored analytics data post-launch to evaluate user interaction with new features.

Hi-Fidelity Designs

• Profile Setup (Your Baby): Created an intuitive and welcoming onboarding experience for parents.
• Leap Chart: Provided a visually engaging way for users to track their baby’s developmental stages.
• Leaps & Signs: Designed detailed, accessible layouts to present key information about developmental leaps, signs, and behaviours.

Figure 1.1 — your baby (profile setup).

Figure 1.2 — your baby (profile setup).

Figure 1.3— leap chart.

Figure 1.4 — leaps.

Figure 1.5 — leaps ABC.

Figure 1.6— leap 1 (signs).

The Result

The redesign was a resounding success:

• Over 50,000 reviews with an average rating of 4.9/5.
• The updates strengthened the app’s reputation as a trusted resource for parents worldwide.