Edited by birdie.lee - 5/9/13 at 7:41am
A ring sling (we loved our maya wrap when DS was a newborn/small baby) would be cooler. If you want two shoulder support a mei tai would also be cooler (we started using ours when DS was about 10-12 pounds with his legs froggied).
A ring sling might be cooler... Plus, it's OK to dress your baby a little less warmly than you would if he/she were in a stroller. People never seem to understand how much body heat babies get when they're being carried! You'll know if he/she gets cold.
I found I was almost always overheated in the first few months after birth. I'm not sure why but I think it was hormonal -- it was the middle of a Montreal winter and I was happy with a light fall jacket!