I've been attempting to "wear" Baby Derek around the house as much as possible when he is fussy and refuses to sleep on his own. Lots of other cultures rely on slings to carry, feed, burp and nurture babies while they go about their business. We inherited the NoJo and Baby Bjorn carriers from Mike's mom. This is the Moby Wrap that we also have. So far its worked the best since it hugs Baby close to the body.
Some days Derek HATES the sling - even though it does help with his reflux. The other day though he took a 2-3 hour nap in it and it worked out ok even though he seemd a bit slumped over. As long as he's breathing (and sleeping!) - I'm a happy camper.