| Sumario: | Background A limited number of studies have examined infant crying patterns in less affluent societies, but none of them have been longitudinal in nature. The aim of this study was to describe reported infant crying patterns in a cohort of Mexican infants and examine how these are associated with crying-related maternal expectations, general perceptions and help-seeking behavior. Methods Observational cohort study, 204 primiparous mothers and their infants, recruited at birth and visited in their homes at nine different time points from 1 to 24 weeks of infant age. Results Mothers reported that their infants cried less than infants in other more affluent societies, although not less frequently. A previously reported evening clustering of crying was present, with a subtle 24-h crying peak emerging around 2 to 4 weeks. Having an expectation of an infant who will be difficult to soothe and/or an increased report of crying frequency were associated with perceptions of maternal anguish, which was associated with maternal concern and help-seeking behaviors related to crying. Conclusions Similarities and differences were found in the crying patterns reported by mothers of Mexican infants and others previously studied. Expectations and reports of crying behavior were associated with maternal perceptions, which may have a role in reducing crying-related anguish and demand on health services.
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