What Is The Right Quantity Of Formula To Be Fed For Infants?

Hi I'm a first time mom my baby boy just turned one month yesterday he seems to eat every 2-3 hrs I feed him 4oz is that OK for him ? Sometimes he cries but I'm scared to feed him 5 oz I think that's a lot for him but if he goes to sleep hungry he doesn't sleep good I'm feeding concentrated formula no breastfeeding