6 months, and going strong. Liam is just as comfortable as the day I first wore him!! This wrap simply doesn't compare to the baby Bjorn, which made my back hurt, was completely uncomfortable, and simply didn't offer the support the Moby does. I am able to use it as a semi cover when nursing, and blanket for my toddler. I love the unconventional usage I get.
I would suggest ordering two, so that when one is dirty or being washed you have another to wear.