That is great news!
Our dog Daisy also has MVD - she is almost 10 and is very well managed on a home cooked vegetarian diet formulated at 15% protein, 6% fat and 16% fiber. She has IBD and allergies so the diet she is on takes these other medical problems into account. We have seen her BATs go from over 100 postprandial to normal limits with diet alone.
We chose not to do a biopsy on our dog because of various reasons and opted to try diet changes first. Initially, we used the Hill's L/D diet but were dissatisfied with it and the dog was not in optimal condition.
Good luck with your baby!