A baby is a very young human, typically defined as a child from birth to around one year old. During this stage, babies undergo rapid physical and cognitive development, learning to interact with their environment and caregivers. They communicate primarily through crying and cooing, signaling their needs for food, comfort, and attention. In addition to physical growth, babies also develop essential skills such as grasping, rolling over, and eventually crawling. Caregivers play a crucial role in nurturing a baby's development through activities like talking, singing, and playing, which help stimulate their senses and foster emotional bonds.