I understand that it is nice to give treats on occasions when they deserve them or are in the habit of getting them.
For months after my dog had the bout of P I just kept to the prescription low fat diet. As time went by and the numbers were good, I added small amounts of lean home cooked chicken breast and plain well boiled rice to his kibble. I gave no treats then. However, later, I found a small chewy soft treat that can be broken into tiny pieces that he loves, and these have not caused any issues. The treats are made by Cloud Star, and are called Tricky Training Chewy Treats. The main ingredient is chicken liver and they are made in the US, wheat and corn free.
If you go on the website you can get all the info.
These may not be every one's choice as they are only low fat, not fat free, but they are Real Treats if that is what you want. I probably give no more that four per day , and even break them into smaller pieces. As long as it is a treat my dog is not bothered by the size
Good luck and praying that Your baby stays well from now on.