RESUMO
OBJECTIVE: To assess whether infants with colic that resolved before 6 months of age have poorer medium-term outcomes than infants without colic. STUDY DESIGN: Comparative study of 2 prospective, community-based cohorts of children aged 2-3 years in Melbourne, Australia: children from the Baby Biotics study, with previously diagnosed Wessel criteria of colic without problem crying at 6 months (True Colic Cohort), vs children from the Baby Business trial, without problem crying at 1, 4, and 6 months (No Colic Cohort). Caregiver report of child internalizing and externalizing behaviors (primary outcome), temperament, regulatory (crying/sleeping/feeding) problems, and family functioning at child age 2-3 years was collected. We conducted regression analyses of mean differences/ORs adjusted for child sex, age, social disadvantage, parental education, and maternal mental health. RESULTS: In total, 74% of the original Baby Biotics (n = 124) sample and 75% of the Baby Business (n = 503) sample completed questionnaires. In adjusted analyses, there were no significant differences between the True Colic Cohort (n = 99) and No Colic Cohort (n = 182) in internalizing behavior problems (adjusted mean difference 0.73; 95% CI -3.96 to 5.43, P = .76) or externalizing behavior problems (adjusted mean difference -1.53; 95% CI -6.02 to 2.97, P = .51). There were no statistically significant differences between groups in temperament, parental perception of regulatory problems, or family functioning. CONCLUSIONS: Infants with colic whose crying self-resolves do not experience adverse effects regarding child behavior, regulatory abilities, temperament, or family functioning in the medium term. Parents and clinicians can be reassured that infant crying as the result of colic, and related stress, is short-lived and will likely resolve.