...and I'm not sure why. It's been like this for months--sallowish, pale, see-through skin and slight dark circles under their eyes. I feed them a balanced diet of fruit, veg, dairy, protein and carbs, and they still drink between 500 and 750 ml of formula/day. They sleep 7-7 and get regular 2.5 hours of daytime naps. We go outside a lot, so it's not like I keep them indoors.
Is it just the way they look, or am I missing something health-wise??? 