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Good points all. However, do note that a thicker diaper is not necessarily more absorbent than a thin one. If two diapers have the same absorbency I will select the thicker one as it probably has more fluff pulp that will help wicking. --John

Same for thick as well. Thin always means it will have more sap (super absorbent polymer). And too much sap to padding means it will take much longer for the diaper to absorb pee, and also be much more likely to leak. Thin diapers are also more expensive than thick diapers too. Think about it, every time you change a thin diaper you're paying for an new waterproof shell, tapes, elastics, etc. But go with thick and every minute past changing a thin one you're only paying for the added padding. On a per day basis, the cost of a thick diaper always comes out cheaper. Then there's function too. A diaper's entire purpose is to prevent embarrassing leaks. Thin fails at this way too often, and thick excells at not leaking. Going with a thick diaper is what's called a no-brainer. Especially when you consider this "a thick diaper that has done its job is way less noticeable than a thin one that has leaked".