Can share how many ml/oz does your one month old baby drinking?

when my boy was a month old, he drank only 30ml every 2 hours. he was born at 2.5kg. nurses in KKH gave me this formula Weight x 150 / 8 to calculate how much to give him. even till now, my boy is 5months old and rarely hits 750ml a day. his required amount is about 1000ml. but he's happy and healthy and growing well so don't stress too much because every baby is different. :)