bacpac..have a look at the sled that Kevin Callan is using over at his Happy Camper Youtube site.he was doing some hot tent camping up at the Kawartha Hightlands.
my Mom who grew up in Canada back in the 1920's would leave me outside in the baby buggy during the winter,lots of blankets of course.she felt you had to expose kids to the cold and fresh air!
maybe thats why i like to campout so much??