An infant is a young child, typically defined as being from birth to one year old. During this stage, infants undergo rapid physical and cognitive development. They learn to recognize faces, respond to sounds, and begin to develop motor skills, such as grasping and crawling. Infants rely heavily on caregivers for their needs, including feeding, diaper changes, and comfort. They communicate primarily through crying and cooing, which helps express their needs and emotions. Proper care during this stage is crucial for healthy growth and development, laying the foundation for future learning and social interactions.