68 wet diapers a day!!?? What?--You must mean 68 a week (I hope!) but certainly not all in one day! Talk to your doctor.
She meant 6 - 8. I presume OP is on mobile, which doesn't register dashes.
OP: If they're genuinely very wet and heavy, then you should definitely speak with the doctor. If you're just changing her every single time she pees, I don't think that's necessary.