Small babies need no stimulation, because every meal develops these senses, but as the baby gets older, taste is a way to explore, and he will try to mouth everything within reach. Try not to discourage this response, unless, of course, the object is sharp, poisonous, or something that make choke the baby. Sense of Smell. The various scents of a household provides ample opportunity for baby to exercise his sense of smell - mom's perfume and the roast in the oven, for example. Sense of Sight.
Babies begin learning immediately from what they see.
Quilts, toys and books for baby should show sharp color contrast when possible. The number of toys at any given time should probably be limited to avoid confusion. Sense of Hearing. If the baby is disturbed by music, turn it off. Sense of Touch.