Dd1 and ds were always changed about three times a day as they chucked and were always washed without fail daily, dd2 had reflux and tummy pains but no chucking so she hated being changed so usually only once a day occasionally she would stay in the same ones for 24 hours. I couldn't imagine keeping them in the same clothes longer as others have said we feel yucky so kids are probably the same? Dunno but it seems wrong to keep them in the same ones for a couple of days just to save on washing!