Observatory on Cow's Milk Protein Allergy

Inclusion Criteria: * Infants up to and including 8 months (up to 8 months and 29 days). * Initial diagnosis of allergy to cow proteins, suspected (clinical presumption) or confirmed. * Prescription of the substitution formula Pepticate® Syneo, according to the doctor's judgement, whether the child is under mixed or weaned breastfeeding. * Authorisation from a legal representative for the child to take part in the observatory and to collect personal information about the child and the family. * Membership of the social security system. Exclusion Criteria: * Infants who have already received partial or total replacement infant formula (regardless of the type of infant formula). * Contraindication to the use of symbiotics (short small intestine, parenteral nutrition, post-pyloric feeding, central venous catheter) due to the use of Pepticate® Syneo®. * Diagnosis of severe cow protein allergy requiring an infant amino acid formula from the outset. * The child's legal guardian is protected (under legal protection, or deprived of liberty by judicial or administrative decision). * The legal representative is unable to understand the study protocol.