How much to feed my 10lb baby

Brittany
FTM - my baby Dawson was born 8lbs 11 ounces, he is now 3 weeks old and weighs 10lbs. I usually give him 3-4oz of formula and/or breast milk (supplimenting) depending on how hungry he is. And he eats about 9 times per 24 hours give or take. Does that sound like a lot or right on track? I don't want to be overfeeding him