How much newborn drinks

Since Im a ftm, im not sure how feeding goes. Baby is on formula fully. Hospital feeds baby 30ml, and so we also followed the amount when we’re back home. But after a few days, we realise baby kind of still hungry even after feeding or minutes after feeding. He would either cry or keep smacking his lips or his mouth looking for something. Do i slowly increase his intake by 5ml 5ml ? I tried feeding him 40ml and he finishes it quite fast. How do i know when to increase intake and if the intake is suitable for my newborn? He’s only a week old btw. How much milk do your newborn take ? #firstbaby #advicepls