Bottle feeding question

This is my 3rd child but still finding myself confused/second guessing.

He is one month old today and eats 4oz at each feeding. He eats about every 3 hours but sometimes only makes it to 2.5/2.75 hours. He was 8lbs and 3oz when born. He sleeps from about 9pm to 2am every night.

I am just second guessing myself because I feel like that’s a lot but he doesn’t spit up or act irritable.

Anyone have any insight?