DS is 15 months old and our GP suspects he may have a food allergy/intolerance and has suggested cutting out dairy first to see if that helps (while we wait for a paed appointment). There is a long list of symptoms but the main one is vomiting, and it seems to be worse when he has dairy so thats why we are starting with that.

DS is fully breastfed on demand still, doesnt eat overly much solids wise but he is teething atm so tends to bf more than eat which is fine. We normally use milk for cereal/cooking and he gets a little in a sippy cup with morning/afternoon tea when he is eating more solids and bf-ing less. He gets it mainly for something different, he doesnt really drink a lot so I'm not worried about him filling up on it.

What is a good alternative milk for toddlers? Soy would be out, as as far as I know the protein is very similar? And the hormones not being very good for boys? Which is a shame because he had some of my soy milk ages ago and really liked it lol.
I know of almond, oat & rice milk, have had it myself but would any of those be suitable for a toddler? Not to replace breastfeeds though!

We've done dairy free before, but it wasnt overly strict as I was just hazarding a guess as it being the culprit. Things did improve a little, but then stayed the same for a few weeks when I re-introduced dairy but have slowly gotten worse again. So this time seems a little daunting in comparison as I'll be label reading and not sneaking the odd bit of cows milk into my coffee lol.
Oh and whats the best milk to cook with, for things like mash potato? I found things got a little sweet when using almond/rice/soy milk, it wasnt overly nice lol.

TIA for any advice