I recently cut milk out of my diet due to suspected CMPA; baby had projectile reflux everyday and was very uncomfortable. I noticed over the past three days she hadn’t been sick so thought she was improving.
However yesterday I accidentally ate something containing milk and all through the night she’s been upset and this morning she’s projectile vomited all over me. Would the symptoms present so fast or is it just a coincidence??
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From what I've read it can take 6 hours for ithe milk protein to peak in your breasmilk after ingestion. So it is quite possible!
thank you so much. Do you know how long it will take for all traces to leave and for the symptoms to stop?

Yes it can happen that quickly and can take as long as 2 - 3 weeks for all traces to be gone out of your system. Bare in mind, CMP and soya have similar protein structures so those intolerances often go hand in hand, if after 3 weeks your baby is still having some issues, I'd advise trying to go without soya for a while too and see if that makes any difference.
My little guy (now 3 and no longer breastfeeding) ended up having issues with cows milk, soya and oats to it made alternatives a bit tricky but worth it if it makes their day to day lives more comfortable.
My partner has long term untreatable trauma to his digestive system due to ignored food intolerance as a child causing permanent damage so I've been able to see from this end of it how important it can be as I see him suffering daily even now he's cut his triggers out of his diet its sadly too late to be fully pain free now 😥

I'm not sure about how long it stays in your system, to be honest everyone tells you something different, but as hard as it is now, know that bub will be okay even if you have a slip up or two. I know I have had many!
She might just take a few weeks for her gut to get better.
My only advice is, if you have access, see if you can speak with a good pedeatric dietician or a health professional who you feel supported by.