I don't bother buckling them in anymore, mainly because they're too big & squirmy now, so my son, who sits in the back, ends up standing up and almost falling out 1/2 the time. They're almost full time walkers, but I don't think we're ready for the stand and ride stroller yet. We actually have one of those, it's what their infant car seats sat in... but it suuuuuuuucked as a regular stroller.
Anyway, what say ye fellow parents of multiples about this? What works, or did work, great for you? TIA!