Regurgitation is defined as the passage of refluxed gastric content into the throat whilst vomiting is defined as expulsion of refluxed gastric content from the mouth.
More than half of all infants age 0-6 months have at least one functional gastrointestinal disorder, the most common one is regurgitation. The frequency of regurgitation varies with age, with infants up to the first month being more frequently affected (up to 80% of children during the first month of life). Most infants are happy and healthy even if they frequently spit up or vomit. Regurgitation represents 25% of paediatric consultations