Fisher Price Smart Stage 3-in-1 Swing Specification.. The smart stages swing is 3 products rolled into 1. It comprise of a full size open top swing, toddler rocker and infant seat. Features Birth+ up to 40lbs 2 speed swing Plays 5 tunes Volume control Toybar with removable toys The seat is easily removed from the frame Easy to store Seat has a fold out kickstand for sleeping or feeding Seat converts to a toddler rocking chair Requires 4 x D size batteries (not included) Other Facts The Smart Stages 3-in-1 Rocker Swing is three products in one! It is a full-size open-top swing, an infant seat and a toddler rocker. The seat easily removes from the swing frame so mom can move baby around the house or can put the swing frame away when child is older. The swing has two soothing speeds, five songs with volume control and a toybar with two soft removable toys. The infant seat has fold-out kickstand for feeding or sleeping. As baby grows, the seat also converts to a toddler rocking chair which accommodates children up to 40 lbs