alpie funny you mention that (about FF babies being grossly obese and all that) as I was just reading about it in some medical stuff this morning before reading your post. I now have visions of little fat babes in swimming shorts
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silvie I absolutely rate a stretchy wrap like a Kari-me or MAM jersey wrap for a little baby. It's incredibly comfortable and I can carry Comma in it all day and get stuff done round the house, too. It's a bit faffy to put on and can get hot on a hot day but otherwise brilliant.
For speed I use a Rockin Baby pouch - a one shoulder sling. Comma's now over 14 Lbs at 3 months and I can carry him for however long with it.I recently got a ring sling from them and used it all day at the Christening. You will see the photos on FB. It's not quite as comfy as the wrap but pops on and off in a second. I've used the pram ONCE in 3 months (other than at home in the garden) and I much prefer the sling.
The key to a one-shoulder sling is getting a perfect fit. If you buy a pouch, get an adjustable one rather than one which is just a circle of fabric.
I don't rate a Baba because you can't cap the shoulder. The shoulder is very padded which seems nice but it's poor ergonomically as the weight/pressure point is diagonally onto your neck and the top of your shoulder. Compare that with, say, a Rockin Baby sling where the fabric caps the shoulder, keeping the weight spread across the whole shoulder and the main weight pulling against the top of your arm which is much better than your neck.
One shoulder slings MUST be fitted properly. I recommend going to a sling meet (www.slingmeet.co.uk). Go to your nearest to see different ones.
The one box suggested is similar to my Mei Tai which I carried LC in until he was 2 1/2 - highly recommended once they're big enough to support themselves - 6 months plus.
One sling doesn't do all. I use the pouch mostly, wrap when I'm carrying him for a longer time and don't need to take him in and out of it and will use the Mei Tai when he's bigger (and still the pouch or sling)
Feel free to email me if this has confused you more!