Abstract: A heat sustaining system disclosed here includes an insert element positionable within high chair feeding members, and further includes a heating element and an electrical power source. The high chair feeding members are a high chair tray liner or a high chair tray. The insert element is housed within the high chair feeding members, where the high chair feeding members define a cavity. The heating element is inserted into the cavity of high chair feeding members to transfer generated heat to an upper surface of the high chair feeding members, thereby conductively transferring heat to the surface of the high chair feeding members. The electrical power source is positioned adjacent to the heating element to heat the heating element, where the heat generated in the heating element is of a predefined temperature which sustains the heat of a food item positioned above the upper surface of the high chair feeding members.