THE INVENTION REFERS TO A DISPOSABLE COVER FOR USE IN AN INCUBATOR FOR PREMATURE INFANTS COMPRISING A MOISTURE-PERVIOUS SURFACE LAYER AND A PREFERABLY MOISTURE-IMPERVIOUS BACK SHEET, WHEREIN THE TOTAL WEIGHT OF THE COVER BEFORE USE IS COMMUNICATED TO THE CAREGIVER BY INDICATION ON SAID COVER, A LABEL ACCOMPANYING SAID COVER OR ON THE PACKAGE FOR SAID COVER. THE COVER MAY FURTHER BE PROVIDED WITH A WETNESS INDICATOR.