Aiyoh, 1 month old babies usually drink 2-3 oz per feed, so your baby's intake sounds normal lah, but if dia seems hungry after 2 oz, you can try 3 oz and see if that helps. A few of us mums found that at this age, sometimes babies want more because they're going through a growth spurt, or sometimes they're just comfort feeding, hard to tell lah, but the fact that your baby wants more within an hour might mean 2 oz just isn't cutting it for your little one, so gradual increase is okay to try!