How often should you wash children's clothing?

After each wear - 7 (87%)
After several wears - 1 (12%)
Only when visibly dirty - 0

I wash the boys clothes after each wear. This is somewhat out of habit. When they are newborns they either spit up all over their clothes or have a "blow out diaper". So that is a given, you wash after each wear. But I was starting to wonder if it was really necessary.

Maybe as kids get older you won't have to do this as much. But right now the boys are too messy not to wash them after every wear. Their clothes may have food on them, grass stains or dirt from outside, germs from other kids, pen/marker/paint or perhaps they used their sleeve to wipe their nose or mouth. I was just trying to think of ways I can cut down...if I didn't wash them after each wear I would use less water washing, use less detergent, spend less time washing clothes! Well dryer is done, must go fold the towels.