I can't believe there are so few reviews for this product! After our baby outgrew the Love to Dream swaddles, we switched to these, which worked out ok because the small in this brand has a higher minimum weight than a lot of other swaddles. Our baby is seven months old, and I just purchased the size medium. For him, the height and weight range on the label have been very accurate.
One of my favorite things about this swaddle is the zipper. It starts at the top and finishes at the bottom. There's never a zipper pull rubbing against baby's chin. There's also a flap at the end of the zipper that buttons closed to cover the zipper pull. I'm not big on changing my baby without removing him from the swaddle, but it would be easy to do so. Also, there's a ton of leg room in this swaddle, so he can kick his legs around or grab his toes through the blanket.
I've bought a lot of Burt's Bees Baby items for this baby, and they are so worth the money. They're soft, they're sized generously, and they hold up well after many washes.