Otherwise healthy infants (1-12 months of age at the diagnosis) with CMA were prospectively evaluated. Patients with cow's milk protein-induced anaphylaxis, eosinophilic disorders of the gastrointestinal tract, and food protein induced enterocolitic syndrome were excluded. A food challenge was performed 6 and 12 months after the diagnosis to assess clinical tolerance acquisition. Main demographic and clinical characteristics were collected for each patient.

Inclusion Criteria:

• Otherwise healthy infants (1-12 months of age at the diagnosis) with cow's milk allergy were prospectively evaluated

Exclusion Criteria:

• Patients with cow's milk protein-induced anaphylaxis, eosinophilic disorders of the gastrointestinal tract, and food protein induced enterocolitic syndrome were excluded.

We prospectively evaluated otherwise healthy infants (1-12 months of age at the diagnosis) visit one the Pediatric Gastroenterology and Allergology Centre because of the necessity of a diagnostic oral food challenge for cow's milk proteins. Children were in stable clinical condition without signs of CMA already on exclusion diet with an hypoallergenic formula for a period of 7-15 days as presented by the general paediatrician, immediately the symptoms appear and before being attended at the Center for diagnosis of CMA.