ADJUSTABLE CHILD DEVICE

An adjustable child device includes a first seat portion, a second seat portion and a belt engaging element. The second seat portion is foldable relative to the first seat portion between a folded position and an unfolded position and is at least partially received in the chamber when the second seat portion is located at the folded position. The second seat portion and the first seat portion are located on a horizontal plane to form a seat part when the second seat portion is located at the unfolded position. The belt engaging element is installed on a lateral side of the seat part and concurrently rotates from a stowed position to a use position when the second seat portion is unfolded from the folded position to the unfolded position. The adjustable child device can be folded when it is not in use, which saves storage space.