Un bebé es un ser humano de una edad todavía muy corta, que no puede hablar ni tampoco caminar. Un bebé recién nacido es un neonato. El bebé es totalmente dependiente de sus progenitores o tutores, necesitando de su atención para poder satisfacer sus necesidades básicas o para realizar actividades elementales. Ante cualquier necesidad o incomodidad, el bebé llorará para atraer la atención de los adultos.

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An infant (from the Latin word infans, meaning "unable to speak" or "speechless") is the very young offspring of a human or other animal. When applied to humans, the term is usually considered synonymous with baby or bairn (in Scottish English), but the latter is commonly applied to the young of any animal. When a human child learns to walk, the term toddler may be used instead. The term infant is typically applied to young children between the ages of 1 month and 12 months; however, definitions may vary between birth and 1 year of age, or even between birth and 2 years of age. A newborn is an infant who is only hours, days, or up to a few weeks old. In medical contexts, newborn or neonate (from Latin, neonatus, newborn) refers to an infant in the first 28 days after birth; the term applies to premature infants, postmature infants, and full term infants. Before birth, the term fetus is used. In the UK, infant is a term that can be applied to school children aged between four and seven. As a legal terminology, "infancy" continues from birth until age 18. An infant is usually called a baby in simple English, as many people use the term 'baby' instead of infant.

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