From what I've heard (from a Chiropracter chick), there's not much evidence that Baby Bjorn style carriers do any lasting damage - BUT that could be because Bjorns aren't really comfy enough to wear for too long at a time anyway, hehe. And obviously there are better carriers, with more comfort for baby...can't say I'd like to hang by my crotch for too long...

I found our Bjorn incredibly uncomfy for ME once River got to even 7ish kg, so, wearing him from 4kg - 7kg - that's not a great lifespan for a carrier! Which is why I did a bit more research once he was out of that! I am LOVING our CatBirdBaby Pikkolo (similar to the Ergo), except that you don't need an infant insert for it, and bub can face out if you want - it's just really versatile. And super comfy, it uses memory foam in the shoulder straps.

Beatrix, if you look at the link Janine gave, it shows good leg positioning. Maybe look in a mirror next time you wear MJ and see if she appears to be dangling from her crotch, or if she looks more like she's sitting in the sling.

In my opinion, Baby Bjorns are good in that, people can enjoy the feeling of carrying their bub hands free at the shops or around the house, and then when it gets uncomfy, hopefully they'll start to look for comfier options. Perhaps that's a bit optimistic of me, but that's what I did. :P

Wow MGM, that's a long overnight wake time! Have you tried waking bub more during the day, so hopefully she'll sleep longer overnight?

Oh yeah, meltdowns, I agree with Bea, it's a sleep deprivation thing, when you're just so tired it's easy to feel overwhelmed. If I find myself teary, I try and grab a nap...not always possible...