This is not a waterproof sheet. I used it for changing diapers and for temporarily laying a baby down. It's not recommended for use in a baby bed as it tends to bunch up. I used it temporarily for changing diapers, on tatami mats, carpets, or places where people walk. It's about the size of a baby bed. I've set the condition to "Slightly scratched or stained." I'm just a regular person, so I don't think there are any noticeable spots, but I think there are some minor signs of use, flattening of the padding, and small stains. Please refrain from purchasing if you are sensitive to these details.