Question about formula

He’s 7 week old, My son almost turn 2 month old on March 1th soon!

I feed him 4 oz while, he keep want more and I give him other 2 oz. it is total 6 oz formula bottle then I make him burp and he spitting but he don’t cry or fussy nothing, just as happy baby. I have to change his shirt. I’m not sure if that’s normal at 2 month old can drink 6oz formula?? It’s my first time because I have other kids, they stay sable drink 3oz-4oz until 3 month old. I’m only concerned because I think 6 oz too much for his stomach?? Please help! Thank you