Your daughter is a very smart lady, Almostbionic. And your grandson obviously has a sensitivity or intolerance, not an allergy (in the truest sense of an allergy) at least not at this time, but she'll need to be careful and make sure that it doesn't get worse. By controlling his diet, she can probably help him develop immunity to the (likely)milk lactose.
Let us know how you get all this worked out in time. So many mothers are learning these things and can benefit by your willingness to share the solution for your little grandson.
Post Edited (It's Genetic) : 5/10/2012 12:45:30 PM (GMT-6)