Mmmm, I think you have to think about this in different terms. I feel like kids and in the first your since they grow so much have growing spurts. Lets be honest everyone's body has times when it doesn't need so much food and at times babies will do with a bit less, when not feeling well, teething, etc. I noticed my boys would need more every few months plus even when they were eating solid food, meaning more food at times not formula or breast milk. At times it varied with the food or formula or breast milk. I can recall with all 3 being up around 5 am with a bottle or breast (depends on which kid it was) to feed him.
I would let mine cry maybe 5 mins then I knew I better get up and do something, honest I thought it was strange but usually they needed something sometimes I'd even get away with holding them and they'd go back to sleep.
I had a ped in Fl with my first child she was a doctor and a mom she had get this 5 kids all under 10 years old...I was impressed. So she had me about 3 months old put a teaspoon of rice cereal in the bottle, yes I know I've heard all the mom's freak on this but hey she was a doctor and a mom I figured she knew what she was talking about. For my first child it worked it helped him we just did it at the 11pm bottle he'd make it until about 5 am...I thought it was great he's fine, he's a great reader, great kid so it didn't hurt him. Each one of my kids ever different.
Just wanted to share my experience and wish you the best....they are all so different.