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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.
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.
==Physical characteristics of newborn==
A newborn's shoulders and hips are wide, the abdomen protrudes slightly, and the arms and legs are relatively long with respect to the rest of their body. In first world nations, the average total body length of newborns are , although premature newborns may be much smaller. The Apgar score is a measure of a newborn's transition from the uterus during the first minutes after birth.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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