What Am I Missing??

For the last month is seems my crew has had non stop super poops. They are all in diapers still so that is a bit of blessing but these ones are so bad that even a good diaper can't contain them. I have shampooed the carpets, bleached every hard surface, washed all the bedding and soft toys. My hands are chapped from washing them so often. There have been no diet changes either. It is eating up there little bottoms and I am sure if we can't find a way for this to end the parents are going to assume it is from here. I need some suggestions for things I may not have tried.