Can milk overproduction look like underproduction?

My baby is 12 days old and didn’t gain any weight over the weekend. We have a midwife that comes over every weekday to help us out and weigh the baby. Since baby hasn’t gained weight my midwife thinks I’m not producing enough milk. The thing is my baby makes a large poop every few days or more often. I can see the milk collecting around her mouth when feeding. And when she is done (20+ minutes) I can still express milk from the breast. I read that overproduction can look like frothy bubbly poops which my baby had today. I don’t want to drink a bunch of lactation teas and drinks if I’m already producing enough (or too much milk). I would like to hear some others opinions please … via /r/breastfeeding https://ift.tt/FJ0ObGe