The thermal child seat blanket apparatus provides snug, removable fit to an exiting child seat. The choice of battery power or power via the cigar plug of an auto yields widespread user choices. After setting the initially desired temperature of the heating elements, the temperature is easily moved up or down via the touch control temperature increase and temperature decrease. The seat cover can be used with or without the blanket. While the apparatus is ideally suited for fit to a portable child seat, it may nonetheless by used in any desired application to warm and shelter a child, whether in or out of a seat. The flexible seat cover, blanket, and collapsible accordion shield provide compact portability.