A.V.
I've used the same baby bjorn carrier for all 3 of my children. It's a front carrier, and not a sling, but it's really been fantastic. And even though it was a little pricey (I think it was $80 or $90) I have definitely gotten my money's worth out of it. With 2 young boys and a baby, I really need my hands free when we go out. And the baby loves it so much, that I use it even when I go out with her alone. (She hates being in the stroller; she can't see as much.) So, the baby bjorn has my vote.