Sling question

Hey mummies, can anyone recommend me a sling? My sister wants one for the new baby, but she's afraid it'll hurt her back. She's 4'11" and about 95lbs not pregnant. She had a bad back from a childhood car accident. I'm pretty sure the backpack style ones are out for her. Can anyone give me good info, as I'd really like to buy her one.

In other words, I'm back from Vermont and exhausted. Trip details tomorrow.

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( I can't resist... )