Abstract: A housing 50, provided with a flat top 60 adapted to receive a carry cot or similar infant carrying device, is pivotally attached 36, 38 to respective lower ends of two pairs of swinging arms 26,28. The upper ends 22, 24 of these arms 26, 28 are pivotally secured to beams 16, 18 which in turn are secured to a structure 14 mounted on a base 10. Drive means 70 is provided fixed to the structure 14 and the arms 26, 28 so that the arms may be reciprocated about the upper pivotal connections 22, 24 thereby effecting a rocking movement of the housing. Preferably the drive means 70 comprises a dual coil solenoid arrangement including a sensing coil to determine the direction of movement of the arms 26, 28.