A new study published in The Journal of Pediatrics systematically reviewed the existing literature regarding the epidemiology of functional constipation and functional non-retentive fecal incontinence (FNRFI) in children. This study also assessed the geographical, age, and sex distribution of functional constipation and functional non-retentive fecal incontinence (FNRFI) and evaluated the associated factors. Here, the Cochrane Library, PubMed, and Embase databases were searched from 2006 until September 2017. The review included 37 studies, of which 35 reported on the prevalence of functional constipation and 15 on FNRFI. The findings revealed that the reported prevalence of functional constipation ranged from 0.5% to 32.2%, with a pooled prevalence of 9.5%. While the prevalence of FRNFI ranged from 0.0% to 1.8%, with a pooled prevalence of 0.4%. In addition, the prevalence of functional constipation was estimated to be 8.6% in boys compared to 8.9% in girls. Geographical location, dietary habits, and exposure to stressful life events were reported to be associated with the prevalence of functional constipation. However, data on FNRFI were scarce and no associated factors were identified. Hence, it was concluded that functional constipation is common in childhood and is associated with geographical location, lifestyle factors, and stressful life events. FNRFI is rare, and no associated factors were identified.