What's a good iOS app for tracking a baby's mental development leaps and fussy periods?

The Wonder Weeks app is designed to help parents understand and navigate the predictable, yet often challenging, phases of their baby's mental development. These phases, known as 'leaps,' are periods of significant cognitive advancement that can sometimes lead to increased fussiness and changes in behavior. The app provides a personalized calendar that tracks your baby's age and estimates when these leaps are likely to occur. For each leap, The Wonder Weeks offers detailed explanations of what new skills your baby is learning, how this might manifest in their behavior, and what you can do to support their development. You'll also find tips for managing the associated fussy periods and activities to engage your baby in during these times. With its high rating and focus on developmental milestones, The Wonder Weeks is a valuable resource for parents seeking to understand and support their baby's growth.