Sure sounds like allergy to me-My first guess would be dairy because of all
the milk he already has in his diet and the constipation. Wheat might be the
next choice. Dr. Crook, many years ago, published a safe rotation diet that
would be the easiest route to go with a child this age.
Good Luck-keep us all posted!!
Barbara Leshin-Zucker,BA<IBCLC
Highland Mills, NY