Patent US 6,523,286

A method of identifying the day in which baby food containers are opened. The method includes providing a first set of markers and a second set of markers. Each of the markers include indicia indicating the day of the week. The markers in the first set of markers are distinguishable from the markers in the second set of markers by color or shape. The first set of markers are placed on opened baby food containers that include a known food, i.e. a type of food which the baby/child is not allergic to. The second set of markers are placed on opened baby food containers that include a food that is being newly introduced to the baby/child. The second set of markers serving as a safety device in aiding identification of food-induced allergies.