The reasoning behind why poofy coats and buntings are a bad idea in a car seat is because of compression. You will not get a good tight fit with the harness straps with coats that are thick. It will be impossible. If you are in a wreck, your child will be thrown farther forward per se, until the harness straps compress past the coats material and actually hit your child's body which stops him/her. Tired and feeling ill tonight so I didn't explain too well but that's the gist of it.
It is better to place your child in a thin bunting (thin fleece or something), put them in the seat, tighten the straps, adjust the harness clip, and then layer blankets OVER them.
Something like this:
http://www.hannaandersson.com/style....%7C2%7C7%7C%7C is fine but I wouldn't go any thicker.
Dallaschildren
CPS tech and momma to 2 sons in seats
