Validity of Cow's Milk-related Symptom Score Among Children Suspected to Have Cow's Milk Protein Alergy

Inclusion criteria : * Age: from birth up to five years... * Sex: both Males and females * All children who suspected to have Cow's Milk Allergy that have the following symptoms (chronic unexplained failure to thrive, regurgitation , chronic abdominal distension, skin manifestation such as urticaria \& eczema and respiratory symptoms such as chronic cough, recurrent wheezy chest). Exclusion criteria * Functional GIT disorders such irritable bowel syndrome , Gastroesophageal reflux disease according to Rome IV criteria in children * Organic gastrointestinal diseases like coeliac disease , cystic fibrosis. * Chronic gastrointestinal infections as parasitic infections.