Newborns explore the world through their senses: vision, hearing, touch, taste, and smell. They are attracted to high-contrast patterns and bold shapes. Stimulate their visual development with black-and-white toys or mirrors. For hearing, use gentle lullabies and the soothing sound of your voice. For touch, provide skin-to-skin contact and soft fabrics. Introduce familiar scents and age-appropriate teething toys to stimulate taste and smell.