DD2 was diagnosed as having a cow's milk protein intolerance at 18 months. She was very small and skinny, with bad eczema, frequent diahhrea and huge dark circles beneath her eyes. I was very fortunate in that I had a close friend whose 2 sons had severe dairy allergies and she recommended a paediatric gastroenterologist and a paediatric dermatologist, who we went to see privately, thus sidestepping all the frustrations involved in getting a correct diagnosis.
In the past 6 months, since her diagnosis, there has been a huge turnaround - dd2 is still skinny and petite but her eczema has vanished, she is full of beans and generally high on life. So different to before the dairy-free diet. We saw a good dietician who immediately told me I had to put her on Nutramigen, as rice and soya milk was not nutritious enough nor did it contain enough calcium (even the enriched with calcium versions) for an underweight child. She also told me that if you do use the calcium-enriched rice milk you must shake it violently for a minute before pouring it out as the calcium is added in the form of a syrup which separates out to the bottom of the carton while it is standing in the fridge.
Getting on to the Nutramigen (which stinks) took about a month, and I did it by slowly introducing it into her Aptamil (started off 1 oz Nutramigen and 6oz Aptamil then slowly upped the Nutramigen and lessened the amount of aptamil every 4 days). She didn't even seem to notice and is still on 2 bottles (11oz) a day as she is still quite underweight for her age.
We went back to the doctor after 6wks as dd2's diahhreaa still had not cleared up. He told us she could not have any soya in her diet as so many kids with dairy intolerance also react to soya and it is actually quite allergenic. We removed all soya and her gut totally cleared up - now we have one regular pooing session a day after supper (sorry to be so graphic!). This is a pain as she can't have provamel yogurts or tofutti ice-cream and makes puddings a nightmare. I offer raisins, jelly or stewed fruit instead. A friend told me that you can buy UHT rice-based yogurt type desserts in some health-food shops (apparently they are an Italian make) but I've never managed to track them down.
I cook with tons of olive oil and add huge slugs of Hemp oil to tomato pasta sauce or bolognese sauce. We also eat lots of meat & 2 veg type meals e.g roast chicken, home-made burgers, lamb chops, home-made chicken nuggets etc. DD2 also eats potfuls of hummous.
Hope all this rambling is of some help to someone!