Re: The babies who nap in sub-zero temps
When Levi was 7-8 months old we had walked to the school to meet the older 2, he fell asleep in the stroller on the way home. Instead of waking him or bringing him inside, we all stayed outside and built snowmen while he napped. He had a great nap!
Obviously this wouldn't be with kids in just shirts or jackets - they're bundled up in snowsuits, mitts, boots, hats, and under blankets. If there's no/very little wind, they stay very nice and toasty!