Infancy is the stage of human development that occurs from birth to around 12 months of age. During this period, infants undergo rapid physical growth and development, including significant changes in weight, height, and motor skills. They begin to develop basic reflexes and sensory abilities, such as vision and hearing, which help them interact with their environment. In addition to physical growth, infancy is crucial for emotional and social development. Infants form attachments to their primary caregivers, often parents or guardians, which influence their future relationships. They also start to communicate through crying, cooing, and eventually babbling, laying the foundation for language development.