Abstract: An infant sleeping garment has a main body formed from a front surface joined to a rear surface. The rear surface has an attached flap portion which can be closed to form a rear compartment between the rear surface of the garment and the flap portion. A gel pack can be inserted into the rear compartment when in an open configuration, and retained within the compartment in a closed configuration by closing the rear compartment by a suitable closure element such as a zipper. The gel pack can be removed from the rear compartment by opening the closure element. The infant garment can be used, at the selection of the user, in combination with the gel pack retained within the rear compartment, or without the gel pack received in the rear compartment of the garment.