I agree with Jen, our girls were born September as well and we wrapped them all through summer but in nice light cotton wraps. They eventually didn't need to be wrapped and by then the cooler nights had set in and I put them in a gro-bag which they still use. It is all about a sense of security
Jodi
<img src="http://i2.photobucket.com/albums/y42/twinoski/twinoskisig.jpg" alt="Image hosted by Photobucket.com">