Infancy refers to the period between birth and 12 months of age. During this time, the child is called "infant".
An infant (from the Latin word infans, meaning "unable to speak" or "speechless") is the very young offspring of a human or 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.