How much milk should 1 month old drink

At one month, intake can vary quite a bit from baby to baby, so the range you're seeing could be fine, but it's hard to say for sure without knowing her weight and how often she's feeding. The best way to get a clearer picture is to bring it up with your PD at the next visit, or even just call the clinic to check, since they can look at her growth curve and give you a proper gauge.