How do I check if she really is CMPI.??

[duende]

I've posted this on the allergy board but haven't had any replies, so maybe someone here will be able to help.

My DD is 4 months old, I have been dairy free since she was 2 weeks old and she was put on omperazole roughly at the same time, so we have never been sure what helped ease her reflux symptoms and general unsettled behaviour.
I'd like to check whether she is indeed reacting to diary but not sure how to do it. If i eat some dairy myself and she reacts, will it take couple if weeks for it to leave my body and mean an unhappy baby all this time??
Would I be better off giving her an oz or 2 of normal formula and watching how she behaves?

Her symptoms were always from the digestive tract, she never had rashes or eczema.

I'd like to have the option of maybe giving her a bottle of formula in the evening, at least every now and then, but don't want to force the horrible nutramigen on her if it's not necessary.

Also, if I don't need to avoid all dairy that would make my life easier.
Sorry for the massive post.! Thank you for any ideas.

Ds is under a dietician and I was advised to introduce it via my diet. 2 small portions if cheese took 2 weeks to clear. Only a couple of grouchy days but poo was dodgy for that time.

I'd try some yourself first before giving her any directly. Most babies have a tolerance level, if you face her with full on formula and she is CMPI you are going to have a very unhappy baby to deal with. IME it took less time after a slip-up or a deliberate trial on my part to get back to normal than the initial clearing of my system and DS's when coming off dairy for the first time.
The sequence of increasing allergenicity when introducing is cooked dairy in a processed product (something like a biscuit containing skim milk powder) then hard cheese, yoghurt, whole milk. I'm not sure where formula would fit in that pattern. I'd do tiny amounts of each of those in your own diet and increase the quantity if you get no reaction before trying any of them directly to baby. If you get a reaction you have your answer that you both need to be still avoiding dairy and try again in a few months.
If your baby reacts to CMP via breastmilk then you need the amino acid formulas (Neocate or Nutramigen AA) and not the hydrolysed ones, because the hydrolysed protein fragments are similar size to what passes through breastmilk. Good luck getting baby to take the hypoallergenic formula because it is vile

Thank you. So it looks like I should maybe have a slice of pizza
It will have to wait a bit -she is cutting her second tooth, had her third lot of jabs today and we are in the mists of a horrendous 4 month sleep regression. I think we could potentially struggle to notice any "new" grumpiness....

Great info there bakingtins