I do not have enough solid information about the Helixia Enfants Natural Defense product to make a recommendation. It is best to follow the manufacturer's dosage instructions, but do not expect miraculous results. Additionally, it is advised not to give this product to children under 3 years old due to lack of safety information for that age group. The best prevention for children is a combination of non-pharmacological measures such as eating plenty of fruits and vegetables, getting adequate rest at night, managing stress effectively, and practicing good hygiene habits. Hopefully, this information is helpful to you. If you have any further questions, feel free to ask.