Add a feeding alarm
Add an alarm/reminder where you can chose feeding frequency eg: 3 hourly and when it comes close to it being 3 hours since the last feed the alarm/reminder will sound.

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Wesso commented
Was going to add the same comment as Isamar.
Integrate this app with iOS’s Reminder app. This way it’s pushed through to Reminders and you as the developer can enable these alerts without too much developement from your end. -
Isamar commented
Also this reminder can come Straight to iPhone calendar such as reminder for pumping, bath time and a place to view and add weight, height, head circumference and etc. I have to use another app and I really enjoy the easiness in baby time would like to use only one app for my baby