How many ml formula to give newborn

If your baby if formula fed, how much do they drink for 3 weeks - 1 month old ? My baby boy is taking 60ml every 2-3 hours, but sometimes after feed, he will still be hungry and show hungry cues, should i try increase? Or feed him again like 20ml or so. But everytime after feed, even after burp, he would spit out some milk. So idk if i should still increase or decrease instead #FTM