_________, in which an infant may cry for hours at a time, may be caused by an immature digestive system.

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Colic is a condition in which an infant cries excessively and frequently for no apparent reason. It's thought to be caused by an immature digestive system, which can lead to discomfort and pain. Diphtheria, pertussis, and tetanus are all infectious diseases caused by bacteria, while atresia is a congenital condition in which a body opening or passage is closed or absent.

_________, in Which an Infant May Cry for Hours at a Time