I seem to say this a lot, but the only cover that fit my DS at birth (8 lbs) was a preemie cover. So a OS cover wouldn't have worked for us. We did use a lot of wool, but the 2 brands you quoted are awfully pricey for the length of time they're liable to fit IMO. I've never actually used either brand just because of price.Â
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One of hte beauties of woolies though is that when the babe isn't mobile, them being a bit too big isn't a big deal. It's not like PUL covers, where you can expect them to hold the dipe on - wool doesn't do that anyway. Drawstrings are your friend in wool, IME, because then a too large cover can still be used. If you're dead set on those brands, or price isn't a concern, I'd go with a Small instead of a NB. But I'd probably pick a different brand. Or make some yourself. You have plenty of time to learn to knit or crochet, and making diaper covers is a great nesting project. It's tons cheaper than buying, too. Or if sewing is your preference, you can repurpose old wool sweaters, or even buy wool fabric and sew some up.Â
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If you really want to buy though, Babyology is a great affordable alternative. My only beef with them is no drawstring, but they're practically bullet-proof. My other fave is Pipers Closet, which is actually a wool wrap with snaps, and she'll do custom sizing to fit your child for cheap. Both of those options are under $20, and they're the first woolies I reach for.Â
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Oh, and I'd skip the NB PFs. If you're going with GMD, just get the next size. Most babes outgrow the NBs so quickly, it's not really worth it.Â