This app was mentioned in 6 comments, with an average of 2.67 upvotes
This app was such a huge help with our first. The nurses at the hospital gave us a sheet of paper to track all of our baby's feeding and bathroom instances and times right after I gave birth, and we forgot half the time to write it down. This app was SUPER helpful and we set up the paid version (Pro) on both my husband and I's phones.
It's also nice for tracking weight, height, head measurements, and other details at all of her doctor's appointments. I still use it (though not as frequently) to date.
I always highly recommend it to my friends with new babies, since it's been such a great tracker.
Feed Baby - Pro https://play.google.com/store/apps/details?id=au.com.penguinapps.android.babyfeeding.client.android.pro
Edit: clarification
It's called Feed Baby Pro and it's perfect. Both parents need to buy it, but seriously, it's amazing.