I think that there are some of the same concerns as for swaddling with baby carriers - if the baby's legs are constricted too much during the day, they don't have enough of a chance to develope the reflex arcs in the lower spine. I am not sure if this is a general recommendation, but I do know an osteopath who has had some grave concerns about this. I guess I am just wanting to be open to transporting baby in lots of different ways as I spend a lot of time walking outside normally (though not sure how much that will happen for the first month anyway). In terms of my spine, we went for the Ergo performance, which seems to fit my body well. But we'll see- I have just decided to try to be open-minded and see how the baby wearing plays out - but thanks for the advice. If the Ergo doesn;t work out maybe I will try another before giving up prematurely!
Both of your advice about the squishiness of the bunting is really helpful - thanks! There is so much to learn about baby safety.