I agree with Chris, it shouldn't be a problem if the diet is balanced, only my Pearl had it, none of my others have ever had it.
Main thing which is very important and not really food is a calcium supplement, cuttlefish, mineral blocks or crushed calcium carbonate powder to sprinkle on food. Its very important that as well as chipmunk food, fruit and vegetables and mealworms ect that the chipmunks get a source of calcium.
It is a lack of calcium that causes MBD.