Infancy is a critical period of development that begins at birth and extends through the first two years of life. This stage is characterized by rapid physical, cognitive, and emotional growth and development. Infants undergo significant milestones during this time, such as learning to crawl, walk, speak, and form attachments with caregivers. Research in infancy focuses on understanding the underlying processes and mechanisms that drive development during this period. This includes studying areas such as cognitive development, social development, language acquisition, sensory perception, and motor skills. Researchers in this field use a variety of methods, including behavioral observations, neuroimaging, and physiological measurements, to better understand how infants learn, grow, and form relationships with the world around them. Overall, research in infancy is essential for understanding the foundations of human development and for informing interventions and programs that support healthy growth and well-being during this critical stage of life.