Infantile colic.

Infant colic is characterized by excessive and often inconsolable crying in an otherwise healthy and well-fed infant. Infant crying follows a developmental pattern, starting to increase around 2 weeks of age (corrected for gestational age at birth), peaking at 5 to 6 weeks, and trailing down by about 12 weeks. There is also a circadian component in that infants cry more in the evening than at other times. Infant colic can be thought of as an amplified version of the maturational, circadian-influenced behavior of infant crying. There is substantial evidence for an association between infant colic and migraine. Children with migraine are more likely to have been colicky as infants, and in a prospective, population-based study, young adults with migraine without aura were more than twice as likely to have been colicky as infants. Mothers with migraine are more likely to have infants with colic, particularly those mothers with higher headache frequency. Clinicians should be aware of these associations in order to be able to counsel appropriately pregnant women with migraine about the possibility of having an infant with colic (and its time-limited nature), and to help make an accurate diagnosis of migraine in children and adolescents presenting with recurrent headaches.