Confused about the 2.5oz per lb of body weight guidance

When I search online I see that it’s advised for babies to drink 2.5oz per lb of body weight but as baby’s weight increases rapidly, it’s difficult to keep up with this guidance. I don’t think my first baby ever went past 32oz in a day and he was 99 percentile baby. He only took 4oz per feeding for the longest time as far as I can remember, up until he was 8 to 9 months old.
I have an 11 week old and I try to follow her cues but I am trying to set a schedule and still don’t know how much she should be drinking in a 24 hour period.