An infant (from the Latin word infans, meaning "unable to speak" or "speechless")

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 (Scotland), 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. In utero, the infant can hear many internal noises, such as the sound of digestion, and the mother's heartbeat, in addition to external noises including the human voice, music and most other sounds. Therefore, though a newborn's ears may have some catarrh and fluid, he or she can hear sound from before birth.  There are a number of attachment 'styles' namely 'secure', 'anxious-ambivalent', 'anxious-avoidant', (all 'organized') and 'disorganized', some of which are more problematic than others.