(4)It is appropriate for the health protection of the infants and young children, a vulnerable population group, to establish the lowest maximum level, that is achievable through a strict selection of the raw materials used for the manufacturing of the infant formulae, follow-on formulae, processed cereal-based foods and baby foods. It is necessary that a validated method of analysis exists for the enforcement of the maximum levels. For aflatoxin M1, an international ring trial will be organised by the Commission in order to verify if a level of 0,01 μg/kg aflatoxin M1 can be reliably determined in view of considering a reduction of the maximum level to 0,01 μg/kg aflatoxin M1.