Made some for my grandson when he was a newborn. The pattern I found called them "Wee Wee Wigwams."
http://www.makeit-loveit.com/2009/08...ee-wigwam.html
When my sons were little I used cloth diapers, and had an extra handy for this purpose, but these are so charming. I'm glad you reminded me because my niece is expecting her baby boy any day now.