An infant (from the Latin word infans, meaning "unable to speak" or "speechless") is the more formal or specialised synonym for "baby", the very young offspring of a human. The term may also be used to refer to juveniles of other organisms.
A newborn is, in colloquial use, an infant who is only hours, days, or up to one month 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, full term, and postmature infants; before birth, the term " fetus " is used. The term " infant " is typically applied to young children betweenone month and one year of age; however, definitions may vary and may include children up to two years of age. When a human child learns to walk, the term " toddler " may be used instead.
In British English, an infant school is for children aged between four and seven. As a legal term, "infancy" continues from birth until age 18.
