The Wonder Weeks app is designed to assist parents in monitoring and understanding their baby's mental development. Based on scientific research, it provides insights into the developmental milestones or 'leaps' that typically happen during a baby's first 20 months. Using the app, parents can anticipate behavioral changes and receive guidance on supporting their child's growth.

The Wonder Weeks app is especially useful for new parents or those seeking to understand their infant's mental and emotional development. However, it may be less relevant for parents of older children since its focus is on the first 20 months of a child's life. It serves as an excellent resource for early parenthood guidance.

The app includes features such as personalized charts tracking developmental phases, explanations of each leap, and tips for managing challenging periods. It also has a diary function for recording observations and a community forum for sharing experiences with other users.

While the app may require an initial purchase, there are no mandatory in-app purchases or subscription fees. Additional features and content are available through optional purchases to enhance the user experience based on individual preferences.

The app features a user-friendly interface that is easy to navigate, even for users with limited technical skills. It offers clear instructions and intuitive controls, guiding parents smoothly through each developmental leap and providing an informative experience.