In common terminology, a baby is the very young offspring of adult human beings, while infant (from Latin īnfāns 'baby, child', literally 'unspeaking') is a formal or specialised synonym. The terms may also be used to refer to juveniles of other organisms. A newborn is, in mainstream use, a baby who is only hours, days, or weeks old; while in medical contexts, a newborn or neonate (from Latin neonātus 'newborn') is an infant in the first 28 days after birth (the term applies to premature, full...
