1 month today! Twins! Questions

Monique

I had a csection at 37 weeks! This month has flown by!! I was breastfeeding exclusively/then one baby lost too much weight. Had to supplement with formula, then after stressful days/nights decided to just stick with formula a few days ago. How much formula should they now be drinking at a month old? Don’t go to the pediatrician again until their 2 month appointment. Also anyone have a csection and weeks later loose what seems to be the mucus plug? I still have random bleeding/slimy discharge coming out..not sure if it’s normal. Also one twin has an outtie belly button..do any of your babies have an outtie this early?? Here’s some pictures!!