Honestly, prefolds and flats are the most durable but I don't know that it is realistic to expect to get anything else to last through 4-5 kids. I don't think all of your PFs and flats will necessarily make it that long. Wool would also be very durable. Anything PUL is a bit of a risk but it is so easy to use (washame and such). I hope to get 2-3 kids' use out if my BG 4.0s but I have a large stash of them and they are rotated. Covers? Maybe new for each kid or 2 kids' use.
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