I downloaded an app called Kinedu. Havent used it yet because baby isnt here yet but my sister uses it and says it’s pretty great. It tracks baby’s milestones and has specific activities to help with development.

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Android and apple user here... dont mi d getting recommendations for both.

I use baby tracker and it has the same things she stated ⬆️

I used baby daybook with my now 3 year old. I could track sleep, feedings, height, weight, diaper changes, etc. I have android. Not sure if it's on ios though.