M.R.
We had the JJ Cole heavy cover for when my son was newborn (end of January), then switched to the lightweight one. We loved it, they wash well, and he didn't even need a blanket in over him. We actually didn't use them long because he's a little hotbox and would be soaked through with sweat, even at a couple months old (what we did was cover him for outside, then unzip and flip the top back once the car was warm.) I definately recommend them, and we're getting one for my SIL when their baby is born!