Feeding schedule help

My 3 week old wants to eat every hour. At night she sleeps for about 3-4 hours then eats about 2oz then goes back to sleep and wakes again 3-4 hours later. I'm so happy she sleeps likes this at night. But during the day it's a little different she wants to eat 1 to 2.5 oz about every hour. This just started about 3 days ago. Is this normal? Or do I need to try to get her on a schedule where she eats every 2-3 hours instead of every hour. It doesn't bother me, I'm a SAHM. I assume she is just growing but I keep hearing she needs to be eating blah blah oz every blah blah blah hours. TIA!