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Colic is a disorder of early infancy marked by excessive amounts of loud, persistent crying. Lesser amounts of crying are considered normal in infants. Neither the crying of colicky infants nor the baseline crying of normal human infants have any homologue in the vocal behavior of other mammalian infants. This human-specific cry continuum may reflect a human-specific discomfort continuum which is function of the general immaturity of human neonates. Such immaturity may be the result of selection for altricial birth forced by cephalo-pelvic incompatibility during birth.
Barr, R.G., (1990). Carrying, colic, and culture: Crying in context. Paper presented at the Seventh International Conference on Infant Studies, Montr
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