Abstract: The infant transitional sensory system provides a hammock which may be supported in any of various positions from a deep pocket to a relatively flat or spread position to receive an infant thereon. It includes a sonic device that may be received on and attached to the sheet for generating audible and vibrational impulses simulating the human heart beat. The sheet preferably is of a soft, textured, flexible material, the system providing an enriched environment and substantial tactile kinesthetic stimulation for the newborn to stimulate the normal, full development of the child's primary sensory systems in a uniquely effective, simple fashion.