In one example, we describe a method and system for infant's development, which is a disc system, with various combinations and extensions. The brain is the only organ that constantly reorganizes itself based on experiences or lack thereof. Babies are born with millions of neurons. Through a process called “pruning”, certain ‘circuits’ are fine-tuned through repeated practice and stimulation. This occurs from birth, throughout early childhood. The purpose of the SensiMo Disc is to provide an infant, e.g., typically, up to the 25 lbs. and / or 29 inches long, sensorimotor stimulation, while lying in a prone or supine position, with minimal active movement of the head or extremities. As the child lays supine or proneon, on the SensiMo disc, the child's tactile, vestibular, and proprioceptive systems are stimulated. This helps develop the child's sensorimotor system. Many other variations and combinations, plus advantages, are discussed.