Hi Krista, I hope I can help you because I understand how frustrating it can be starting out. I'll tell you what I know, as I understand it. I'm sure you'll get more responses that are more scientific. There's lactose intolerance. When the body lacks the enzyme needed to break down lactose. Depending upon the severity of the lactose intolerance, they may be able to handle some lactose. Some people can have yogurt, cheese or other lactose foods but only in small doses. My son's pediatrician (my son is 4) told us to experiment. Give him a 1/4 cup of milk and wait. Let him eat a cookie with it. Eating something else with lactose is always better. Because of my son's severity to lactose, we have eliminated it all together. Than there's milk protein allergy. These are casein and whey. If it is a protein allergy, you'll have to look at the ingredients in everything before giving it to your child. We were told to not let my son have any milk (lactose or the protein) for 6 weeks. Then slowly introduce one new thing at a time. He is also severely allergic to the milk protein. I hate to say this, but it is primarily trial and error. It is hard to do when your dealing with such a small child. It does get better!!! Since he can have margarine, it may just be a lactose intolerance. If you decide to eliminate both from his life and you need help finding foods that your child can have, write me back. Things change all the time, but I can give you the list I have of foods that are lactose and milk protein free. Good Luck to you. You can write me privately at [log in to unmask] Jessica L. _____________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com Or call Juno at (800) 654-JUNO [654-5866]