Infant colics represent a clinical condition in childhood, characterized by an uncontrollable crying that occurs without any apparent organic cause.1 They can be associated with face redness, closed fists, thighs flexion, meteorism, and gas emission. They are generally diagnosed according to Wessel's "rule of three" (>3 h of crying a day, for >3d a week, for >3wk in a row).2 These crises tend to reach their maximum intensity at 6 weeks of age, in most cases.3 They represent a serious source of anxiety for the family, increasing hospital admissions (5.8% of infants),4 postpartum depression risk, with higher stress levels for up to 3 years from these events. The etiology is still unknown. Anyway, it's assumed that the following factors may be involved: (1) Lactose intolerance. (2) Food hypersensitivity. (3) Feeding difficulties. (4) Disorders of the enteric nervous system. (5) Alterations of pain transmission. (6) Gastroesophageal reflux. (7) Intestinal hormones. (8) Psychosocial factors. (9) Alteration of the intestinal microbiota. In 1994, Lehtonen was the first to suggest that an altered intestinal microbiota composition in the very first months may induce intestinal colics in infants. Human intestinal microbiota is composed of about 1013 to 1014 microorganisms, mainly bacteria. The total number of microbiota genes is called "microbioma" and it is estimated to be 150 times the number of genes in the human genome.5 It acts as a real organ, whose activity can be influenced by diet, lifestyle, prebiotics, probiotics, and antibiotics. Several studies revealed the predominance of bifidobacteria in breastfed infants, whereas bottle-fed infants show a mixed population where bifidobacteria are less represented. the intestinal microbiota composition in a 3-year-old child is already similar to that of an adult.6 Other factors conditioning the microbiota are gestational age and type of birth. Colicky infants have a microbiota with a slow development and a lower stability over time.7 It also contains less lactobacilli and bifidobacteria, and a prevalence of gram-negative bacteria. The stools of these children often show increased levels of calprotectin, an intestinal index of inflammation.