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The term "baby" generally refers to a very young human, typically from birth to 12 months old, though it can sometimes extend to toddlers. This period is marked by rapid growth and development. During the first year, babies undergo significant physical and cognitive changes, evolving from being completely dependent on caregivers to starting to walk, talk, and develop a sense of independence. Babies learn to recognize voices, faces, and develop emotional bonds with their caregivers. They also reach developmental milestones in motor skills, such as rolling over, sitting up, crawling, and eventually standing and walking. Nutrition, primarily through breastfeeding or formula in the early months, is crucial for their growth and health. The baby phase is critical for establishing foundations for physical health, emotional bonding, and cognitive development, making nurturing care essential during this time.