An infant is a young child, typically defined as a baby 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 their caregivers for nourishment, comfort, and safety. They communicate primarily through crying and cooing, expressing their needs and emotions. Proper care during this stage is crucial for healthy growth, and it often involves regular pediatric check-ups to monitor development and vaccinations, ensuring the infant's well-being.