My 2.5 year old is also allergic to milk protein and we found out when he was about 10 months old- seems like ages ago now! And man I felt like what the heck do I feed him- but there are SO MANY alternatives out there now!
We also use Earth Balance butter for toast and such (found at Trader Joe's and I'm sure other places too). Fleischman's UNSALTED margarine STICKS (green packaging) is soy based I think and has no milk- I use that for all my baking and cooking needs. Someone mentioned goldfish crackers- those all have milk in it- unless they found one that doesn't! Teddy grahams and most store-brand "teddy grahams" are usually safe too. Don't forget to check breads- a LOT of breads out there have milk in them- we use Butternut from Meijer (I think that's the name, and yes I know it sounds like it's not milk-free, but it is!). That Purely Decadent coconut milk ice cream is actually very good (and found at Meijer, Jewel- very convenient)- definitely try that out for treats! :)
My little one eats oatmeal with rice milk, cheerios, rice chex, rice krispies, toast, and such for breakfasts. Fruits for snacks. Lots of Progresso soups are milk free and those are great for lunches and dinners. The Tyson brand of chicken nuggets are dairy free (not sure about other allergies)- so those are great. My son also loves beans of any kind and those are great additions to dinners. We've also started trying out quinoa. Couscous is another big hit around here, as are rices. There are a few pancake mixes or certainly recipes out there, too- you just have to look- i can't remember the one we use right now.
GREAT book- Go Dairy Free by Alisa Fleming. Of course if there are other allergies involved, this may not be great. Still, a great resource for making your own substitutes for lots of milk-related products- even whipped cream!
I'm curious to check out that So Delicious coconut milk yogurt- wonder where I can find that?! Glad I looked on here- something new for us to try hopefully! :)
And if you are nursing, make sure you eliminate all milk and such from your diet, too! I had to do that, too.
Hope all this helps! Feel free to message me if you have any more questions! Good luck! You're NOT alone! :)
A. :)