Infants and toddlers are young children typically ranging from birth to three years old. During this stage, they undergo rapid physical, cognitive, and emotional development. Infants, from birth to about one year, primarily rely on caregivers for their needs and begin to explore their environment through senses. Toddlers, aged one to three years, become more mobile and independent. They start to walk, talk, and engage in simple play. This period is crucial for developing social skills and language, as they learn to communicate and interact with others, including their parents and peers.