Had a follow up weight check today and both babies are over their birth weight! At 13 days old, no less!! Matthew is 5.9 (5.7 at birth) and Sarah is 5.13 (5.11). I am so relieved. We're going to back off the formula supplements for now. I will probably start pumping in the next couple of days to build up a nice supply for the occasional bottle. Our pedi suggested that if they start cluster feeding a bunch in the evening that I could skip a feed and DH can give them a bottle. I'd much rather it be breastmilk, so we'll probably head out to rent a pump tomorrow.
She also said that as far as milestones we can ignore their early arrival and they can now be treated as full term babies. The title says it all - woo to the hoo!