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The Clever Diaper solved these problems in a simple and low-cost way. Unlike the traditional paper diaper, clever diaper is wrapped with a special material on the outer layer. This material will reveal the color when it is exposed in a wet environment. With the increase of the urine inside the baby diapers, where the humidity inside is getting large, the outer crying face pattern will become increasingly clear. When a baby pees about three times in the diaper, the pattern has become very clear, and that reminded parents that it is time to change a new diaper.