Randomized double blind controlled clinical trial. Participants will be enrolled at the New Civil Hospital of Guadalajara "Dr. Juan I. Menchaca" during the period from May 2017 to July 2018, from six to 59 months of either sex. The duration of each participant in the study will be of four weeks. Each participant will be randomized assigned to any of the different study groups: synbiotic, prebiotic, probiotic or placebo. Hypothesis: The efficacy of supplementation with a symbiotic, a prebiotic and a probiotic differs in its beneficial effect on the intestinal microbiota and the characteristics of feces in children with CP and chronic constipation.