Healthy infants during the first year of life often have multiple functional gastrointestinal symptoms such as colic, regurgitation and constipation. The usual fuzziness and/or crying at this stage of life is interpreted as digestive discomfort or pain, and the corresponding concerns result in unsuitable behaviors as overeating, interruption of breastfeeding, multiple changes of formulas, innumerable queries and unnecessary medications. The aim of this paper is to update knowledge on the pathophysiology of the most common functional gastrointestinal dis orders, in order to avoid over diagnosis and select the most appropriate therapeutic approach and convenient nutritional interventions.