How can i tell if my 1 year old son is allergic to whole milk?

Allergy: He may have uncontrollable vomiting, blood in his stools, eczema or even hives. If you suspect this you should see your pediatrician. Allergy testing may be helpful.

Remove from diet: Milk allergy can be subtle and does not always show up on acute testing. A good way to determine is to remove it from the diet for a month or so and then reintroduce it. In general milk has some issues...Pesticides, recombinant growth hormones and can be allergenic for many people.