5 visits took place : V1 (inclusion), V2 (randomization), V3 (1 month), V4 (3 months) and V5 (6 months). During each visit, the investigator filled in observational book the anthropometric parameters (weight, height, head circumference, BMI) and pieces of information collected 3 days before by the parents (gastrointestinal tolerance parameters, daily infant behaviour and milk consumption). Global parents' contentment was evaluated as well.