We tried one of these apps for about 3 hours when we 1st came home with LO. We very quickly realized that its just not worth the time and effort. Its just 1 more thing to do in an already busy day.
I like Baby ESP (it's about $5, but well worth it). Not only can you track feeding times, amounts (if bottle feeding), diapers, sleep, etc for baby, you can also set up a separate profile for mom to track pumping, medication, etc. I found it really helpful after I went back to work when DS was little to keep track of pumping output especially, and am using it again this time.
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Medela has a good free one. I use it to track BF'ing and will probably use it to keep track of pumping once I start. You can also track diapers and sleep but I don't use those.
Re: Best baby apps for android?
Ditto