This has become my go-to baby shower gift after using ours for two kids. The 37x37 size stretched fine over the car seat and it's still soft after countless washes.
The organic cotton is noticeably softer than the muslin swaddles we used with my first, and it's held up through tumble drying without pilling. The 37" size works great for tummy time now, and I like that it'll stretch to 45" once she's bigger.
We've washed this thing at least a dozen times and it still feels just as soft as the day it arrived—that stretch up to 45 inches is a lifesaver for my growing toddler. The coral and gray stripes match everything in the nursery, too. Honestly, I'm grabbing a second one for the diaper bag.