I'm curious to know what kind of signs and symptoms lead you to possibly think of a suspected milk allergy? I have been wondering about this as my little girl is having problems with every formula try. We tried why is she became so constipated I had to take her to the ER because she tore and it begin to come out from pushing so hard. Unfortunately I don't know anything about boys formula no I'm not much help.
I could be wrong but constipation is not really a symptom of a milk protein allergy. You can google it but fussiness during/after feedings, gas pains like screaming in pain, mucousy stools that are green and foul, irritability, eczema, and we saw small traces of blood in his stool a couple of times and he is no where bear constipated so it wasn't from a tear or anything like that.
Thanks everyone for your input!