“Diapers need to fit appropriately, prevent leakage, and be comfortable for your baby,” says Dr. DeZure. “So the size can't be too small or too large, can't have pee or poop leaking out from ...

The category is also large for Kimberly-Clark, which gets more than a third of its revenue, or about $7 billion, from baby- and child-care items. P&G is adding new diaper features that it says ...