Baby Routine App

What is your favourite app to track newborn's needs (feeding, changing, sleeping etc) and help you keep a routine? With my first daughter we never had a routine. She fed when she wanted, slept when she wanted, etc and I felt that was not in her best interest because even today as a toddler she fights nap time and bed time every single time. Anyway, this time around I want to install some sort of routine and I was hoping there would be a great app out there to help me stay on track. Any ideaa?