Just a personal anecdote about this: I don't know much about the potential for hip/back development problems (and of COURSE that's something to be investigated when it comes to a baby carrier!), but I was carried in a cradleboard as a baby and I LOVED it. It was a huge part of my early childhood, and a really positive experience for everyone involved. For what it's worth, I have 0 hip/back problems.
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It is a traditional babywearing method in Northern Sweden (though it's not like we gained this knowledge from a traditional culture directly -- my father was born in Sweden but grew up in Canada, and wasn't carried himself). My father made the cradleboard out of found wood, some backpack straps and bent willow branches for the headpiece. He's a total worrywart when it comes to child safety, so I'm sure I was secure. Like I said, I loved it. I was swaddled arms down in it (though I don't know from what age onwards) and found it so calming that I would demand to go in it when I was upset. We also had one of the original (brown corduroy, anybody?) Snugglis, but apparently I didn't like it as much.
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He would take me for long walks in it, probably a few times/week, if not daily. I think like most baby carriers (including forward-facing carriers like Baby Bjorn), it's important to take the baby out of the carrier every few hours and let them stretch/move. I don't know much about cradleboards in Native N. American societies, but as far as I know in the Saami tradition they are used primarily for baby transport, since many Saami societies were traditionally nomadic, following reindeer herding patterns.
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I wouldn't leave an infant in a cradleboard for more than a few hours/day, but I would highly recommend adding it to your (already vast!) babywearing repertoire.
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I may have just gotten lucky, but as I said before, I have 0 back/hip problems (compared to my sister, who has a pretty serious scoliosis -- and wasn't carried in the cradleboard) and now enjoy carrying my own baby. But I have to use a ring-sling -- my dad won't part with his chef-d'oeuvre handmade cradleboard!
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