Now some babies after birth, because there is no breast milk, we have to use milk powder to feed, in this process, must ensure their safety, if the phenomenon of allergies, will have a certain impact on the child’s body, to determine through some basic symptoms, the child has not appeared milk powder allergy. 1, if the child’s milk powder triggered, the body appears allergic to the phenomenon, it is easy to cause a high number of stools diarrhea, but also some manifestations of constipation or blood in the stool, and they symptoms are obvious and last for a long time. 2.Some babies vomit after eating milk, which may also be caused by milk powder allergy. 3.After the child has eaten milk powder, if diarrhea plus skin rashes appear, this means that it is a milk powder allergy. 4. Some children do not feel full after eating milk powder, but cry for a long time, and any soothing has no effect, and their weight, after measurement, does not increase at all, but decreases, which is also likely to be caused by various milk powder allergies. All of these are symptoms caused by milk powder allergy. As young parents, you must observe your child and go to a regular hospital to receive treatment under the guidance of a doctor if any abnormality occurs.