 [ Symptoms ] when babies are switching from breast milk to solid foods is cow is milk neccessary [ Disease ] babies need to be on formula or breast milk for one year after a year as long as they get all of the calcium phosphorous and other nutrients that are in milk and are eating a good well balanced diet they do not really need it milk and milk products yogurt cheese etc  continues to be an excellent protein source and should not be abandoned unless there is a milk allergy or other medical reason to do so