For most parents, a human baby's crying is a particularly evocative signal, which compels them to seek and resolve the cause. Some babies, though, cry for prolonged amounts of time without apparent reason in the first three months after they are born, worrying their parents and leading many to seek expert help. In Western societies, this puzzling phenomenon has come to be known as colic. From a scientific viewpoint, both this word and the nature of the phenomenon that underlies it remain a source of controversy.
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