My youngest has had diarrhea the past few days, and she woke up with poop (sorry) soaked through her sheets and mattress protector! I was not thrilled, since obviously I wanted it to protect her bed. I think I need a better one, but not sure what to look for. Something waterproof, obviously this one isn't. Which one do you have for your LO? We will be potty training soon too, and her mattress is brand new so I don't want it to get completely ruined.