Just catching up with this as it's been a while.
FBTTN8079, are you still worried about overfeeding? I've been worried about this myself. We were feeding about every 3 hours (to their demands) but they have recently been demanding every 90 mins - 2 hours! They take 90-120ml each time, so loads! I pace the feeds and try other things first, but they are just such hungry girls. They are on breastmilk mostly, so I don't know if this makes any different as I think I heard that formula takes longer to digest and therefore babies often go longer between formula feeds or something like that.
They've gained like 3 pounds in 5 weeks. Surely they must be slowing down soon..