A rocker includes a frame and a seat coupled to the frame for receiving an infant therein. The frame includes a front and a rear frame portion generally oppositely extending along a longitudinal axis. The first and second frame portions are pivotally coupled together to move between an upright configuration and a collapsed configuration. The front and rear frame portions include rocking surfaces that are configured to rock on a support surface in a side-to-side motion transverse to the longitudinal axis, with the infant positioned in the seat in a head-to-foot longitudinal orientation.