I wouldn’t worry about it!! Babies eat when they’re hungry and stop when they’re full. Just follow their cues!
same with mine! his first bottle out of me was 50! and even now he’s 3 weeks and has done 120-180 feeds not all the time but during cluster feeding we average now at 5 ounce per bottle x
Just feed him until he's done. Honestly, babies lead you and its soooo much easier that way. Let him tell you when he's finished, feed on demand so not every 3 hours, just when he cries for it and you will find you get into a natural rhythm eventually. Amounts differ by baby and sizes etc. Don't stress, you got this 😊