Abstract: A crib liner or runner made of a soft blanket that is secured in place over a crib mattress's fitted sheet via an easily applied fastener. Design intent is to provide parents of infant and toddler children a practical way in which to “change” their child's bedding in the event it is soiled with formula, drool or other bodily wastes, without requiring them to change the fitted sheet in order to do so. Modified versions of the crib & mattress runner could also be made available for use with children and adult bedding.