Milk allergy??

Hello mga mommies! May nka experience n po b dito na nagkaron ng pamumula lo nyo while bottle feeding? Since newborn kasi nka Nan optipro n po sya. Recently, nagkaron ng reaction. Namula some parts ng face nya, ears, chest and back pero hndi sya pantal. As in redness lng. Kaya im not so sure kung allergy b un tlga. Possible kya na late reaction ung allergy nya sa milk? Ngyon lng sya na allergy after 6mos n nyang gamit? Thanks po 😊