My bad I didn't read right at all lol! Mine was drinking 2ozs every 2 hours of breast milk. I'm not sure on formula because it is much different.
My little one was 4lbs 12ounces at birth he lost a little weight while he was in the hospital a total of 4 days. He weighed 4lbs 8ozs when I brought him home. He gained 3ozs in 2 days and another 4ozs within 4 days. He steadily gained weight at least 4ozs a week. I worried so much that he wasn't gaining enough weight. But now that I look back he was a chunker within a month. Although at the time he seemed small which he was but pictures proved he was a chunky little guy. I miss those days. Hope your little one is doing well.