An infant calming/sleep-aid device that includes a moving platform and a sound generator, the sound and motion adapted to calm a fussy baby, induce sleep, and maintain sleep under normal conditions. The device makes a determination as to whether sound signals represent sound coming from inside the device or outside the device. If the sound signals are coming from the inside the device, then the signals are evaluated in a specified frequency band to determine whether the sound is a baby cry. If a determination is made that there is a baby cry, then a threshold analysis is performed to quantify the cry and compare it to a threshold value. If the cry is above a specified threshold, the device moves the platform and/or generates sound.