My 19 month old has been vomiting up curdled milk every time we put him in his crib. He has not been eating a lot, has rash is milk allergy a cause?

Vomiting. Stomach acid will curdle milk. Your son may be vomiting for a variety of reasons. It is important to discuss with your son's doctor how much you are feeding your son, how the milk is prepared and if anything else is being fed at the same time. Let your son's doctor know if he is also having diarrhea. Best for the doctor to get more history and examine your son before making a diagnosis.