Abstract: A colicky infant's vestibular and auditory centers are stimulated mechanically to simulate womb conditions to ease the transition from womb to postgestational life. In this soothing method an infant is placed in a crib with a mattress and having padded protective sides assuring appropriate positioning on the mattress, to which is imparted a regular, repetitive low frequency sine wave motion progressively traveling longitudinally thereof with simultaneous vibrations, whereby the infant experiences gentle, low frequency, regular, progressive, traveling sine wave motion plus hearing and sensing subdued vibrations like sensations previously experienced in the womb. The protective padded sides encircling the infant offer a warm enclosure while subduing or muffling exterior sounds.