Inclusion Criteria:  Child aged ≤ 8 months; Child newly diagnosed with an allergy to cow's milk proteins (APLV), or with a strong suspicion of APLV (mediated by IgE or not), justifying (according to the doctor) the prescription of Pepticate® Syneo® (extensive hydrolyzate cow's milk protein) Child already fed with an infant formula (partially or totally), or whose parents have already made the decision to initiate an infant formula, in addition to or as a follow-up to breastfeeding. Authorization of one or more parents or the child's legal representative to collect personal information about the child and the family.  Exclusion Criteria:  Child who has already taken an infant formula such as "high protein hydrolyzate" or "amino acid formula"; Child with a contraindication to taking symbiotics (eg: short bowel syndrome, parenteral nutrition, post-pyloric nutrition, central venous catheter, etc.) Child with severe APLV requiring the prescription of an amino acid formula; Legal guardian of the protected child (under legal protection, or deprived of liberty by judicial or administrative decision); Legal guardian of the child who is not a beneficiary of a social security scheme. Inability of the legal representative to understand the study protocol, or doctor's doubts about the ability of the will to comply with the protocol.