Duct tape is truly an amazing tool with a variety of functions. Though, I've never actually seen it used on duct work. I have seen ladies with purses made completely out of duct tape. Car parts can be made more structurally sound with enough duct tape. Duct tape even comes in crazy patterns so it can be worn as an accessory.
I suggest that every parent of small children have a roll on hand at all times--at least in the evening. I have never seen anything that works more effectively to ensure a young toddler's night time bowel movement stays safe and secure in the diaper, instead of finding it's way out to become supplies for midnight finger painting.
It's quite simple; put the diaper on like normal and place a piece of tape horizontally across the diaper tabs.The next morning will be much more pleasant, guaranteed.