Abstract: A infant seat insert in accordance with the present invention includes a backing that is positioned against the back wall of an infant seat, a plurality of first attachment parts that are attached to predetermined locations on the backing, and multiple support cushions. The support cushions include opposing head cushions which are formed with a hollow and include a lower collar portion, opposing torso cushions and a pelvis cushion. The head cushions, torso cushions and pelvis cushion each have a respective second attachment part fixed thereto, which allows for attachment of each respective cushion to the backing. When attached to the backing, the head cushions, torso cushions and pelvis cushions cooperate to establish a support space for the infant. When the infant is placed in the support space for transport, the hollows and lower collar portions of the head cushions prevent lolling of the infant's head, while the pelvis cushion and torso cushions prevent slumping of the infant within the child seat.