A while ago I made an app for tracking baby activities because I became a parent and was horrified at how many permissions the existing apps required and how much tracking they contained. Both the app and the server are open source.
This is a web-app which also has an Android version in the Play Store (F-Droid didn’t accept it because they don’t feel like web-apps should be welcome in their store). On iPhones it can be installed as a PWA to the home screen.
Features:
No tracking whatsoever
End-to-end encrypted, no personal information is stored on the server unencrypted
Track baby’s feeding, diaper changes, breast pumping and sleeping (more to come)
Let me know how it goes if you decide to make the switch!