Abstract: A locking device for a front seat of a double stroller which is capable of locking the front seat after it is turned around 180 degree from a forward position to a backward position includes two engage posts to engage or disengage from a notch of a locating block and a notch of a hook plate fixed on each of two seat locating rods of a main frame of the double stroller so as to lock or unlock the front seat immovable or movable after it is turned around.

Abstract: A handle height adjuster for a baby carriage has a hollow connecting rod for a main rod of a baby carriage to fit movably in an inner passageway in the connecting rod. The main rod can be pulled up or down to raise or lower the height adjuster connected with two ends of the handle of the baby carriage and kept securely at the raised or the lowered height by an insert block sandwiched in a push block and an actuating plate. The insert block can be moved horizontally to insert in one of engaging square holes in the main rod and a square hole in a side wall of the connecting rod with the connecting rod after the height adjuster is adjusted to a new height.