I agree that they can make movement resitricted but for us its a good thing due to mateauz having bad hips. WE have some itti bittis that are slim in the crotch and allow him to move more freely as were a baby beehind can make him look like a stuffed turkey.
Most exciting thing about MCN's...its all trial and error as our babies are all different in shape and size...other good thing...think of the fluffy mail you can get trialing different nappies