AIM:To examine, in a community cohort of healthy one-month-old infants, (i) the prevalence of early infant sleeping, crying and feeding problems; (ii) the extent to which they co-exist; and (iii) infant and mother characteristics associated with each problem alone and with comorbid problems. METHODS:A survey at 4 weeks of infant age examined the presence of infant sleeping, crying and feeding problems (yes/no); parenting self-efficacy; rating of self as a tense person; and doubts about parenting at bedtime. RESULTS:A total of 770 mothers (39% of those approached) with a total of 781 infants (11 twins) took part. Infant sleeping, crying and feeding problems were reported by 38.5, 27.4 and 25.2% of mothers, respectively. On comorbidity, 25.5% reported one problem, 20.5% reported two and 7.3% reported all three problems. Mothers of first-born infants reported more crying problems and comorbid problems. Mothers who described themselves as a 'tense person' reported more infant feeding problems. Maternal doubt and low self-efficacy were consistently associated with each type of infant problem and comorbid problems (adjusting for other factors). CONCLUSION:Mothers expressing doubt and low parenting self-efficacy may benefit from additional support and guidance on normal infant behaviour.