What is the most common cause of diaper rash?

The most common cause of a rash is a diaper that is too small or too snug. If it's too snug it doesn't allow for any air-flow which would cause a heat or sweat rash. We're confident there is nothing in our diaper that would cause a rash. We thoughtfully source ingredients that are hypoallergenic and ultra-gentle on baby’s sensitive skin.