I, too, think you can see an improvement that quickly. (and btw - 2 weeks old is usually when you start seeing the symptoms of MPI). I saw improvements right away with DD2, it was great. Took a long time to get to a safe baseline (she had multiple food allergies) - but just taking out dairy completely was huge.
Honestly - I would give it at least 2 weeks and if your bub is doing well, maybe wait a few months before introducing? If it is MPI it will just irritate his gut more and take longer to heal.
Just be aware that you could see him have off days too in the next few weeks because it takes a while to get completely out of your BM, and then completely out of his system.
SO glad it seems to make him feel better!! ((Hugs))
