Hi Beanigan. My dd was in a Pavlik for 10 weeks, from 8 weeks old onwards. She's been out of it for a couple of months now, all fixed and completely worth it!
Re: breastfeeding, I had absolutely no problems at all, you'll need to get used to how your LO feels in the harness - sort of a "wider unit"(!) so you'll have a leg going up by your armpits but its really no problem at all - in fact I stressed about a lot of things when she was put in the harness, but being able to BF wasn't one of them! Out and about was fine, just fed her in the same position as before the harness, except her legs were in a frogs leg position!
Re: equipment, I think you've already been told Maxi-cosi carseat and moses basket will be fine. DD couldn't fit into the cocoon of our pram (bugaboo bee) but I just used the footmuff instead.
Re: what you should and shouldn't do - have a list of questions ready to ask next week. We were advised the carseat was fine, as was the baby bjorn and that we should do everything "as normal" but you should check what your consultant/physio advises. We were told cloth nappies weren't so good as the rotation of the hip in the pavlik position assists its formation and fixing it with thick nappies (the old way of dealing with clicky hips) wasn't as effective. I expect it doesn't matter too much to be honest.
I found dressing dd the most difficult part as keeping her warm was difficult through the winter months but thankfully you won't have that problem. The harness forms a sort of triangle shape with the straps coming from shoulder to ankle and the thing to remember is that you shouldn't pull the straps in with clothing so anything with a waistband and bodysuit/vests with crotch poppers are out. I also don't think legwarmers/long socks/big tights work for this reason.
So what did she wear?!!! These worked really well for us:
*Babygro one size up but don't fasten the crotch or bottom couple of poppers on the front.
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Dresses that hang loose from the chest in an a-line shape and little socks to keep feet warm (you may get socks attached to the harness but I cut them out so I could clean her toes!)
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As it was winter I used to put the dress/pinafore over the babygro so the babygro looked a bit like tights. (In fact a funky patterned babygro under a plain pinafore looks great and I still sometimes dress dd like that (but without the open crotch now!)
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I covered her nappy with funky nappy covers you get for cloth nappies (so they looked part of her outfit!) Not sure if you can sew but I also bought some frilly knickers nappy covers from John Lewis and cut them down the sides and attached poppers so I could get them on - in fact I'd be happy to post my home-adapted ones to you, they're all age 3-6 months but on the small side. Let me know if you want them.
As you can tell I was a bit hung up about her clothes - it was just before Xmas and we hadn't shown her off to any family so I wanted her to look as normal as possible when she did her meet and greets. I know it's not really important but it was to me. It helped me deal with the whole thing that I couldn't see the harness all the time too.
Also bathing/cleaning. We weren't allowed to bathe or take her out of the Pavlik at all but you just get used to sponging them instead. I'd just advise to be scrupulous about cleaning creases, esp.folds round the groin and knees which are difficult to get to as they can get cheesy and gross and sore.
Like everyone else that's posted I'm more than happy to answer any more questions/share experiences.