These are nice
https://morrisonoutdoors.com/collec...s-1/products/big-mo-20-down-kids-sleeping-bag
A wide sleeping pad and snuggling with them under a wide quilt also works (better for them than for me).
I stripped a kids pack down and ran the pack bag behind it using my hunting frame. Awkward, but works.
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REI is the spot for clothing, not cheap, but can get down and things I would actually use.
For base layers, Iksplor is great, pretty durable for wool and much better than the REI brand.
The natural comfort of ethically sourced 100% merino wool clothing. Lightweight and breathable base layers are perfect for year-round travel and adventure.
iksplor.com
Keen boots work pretty well and are available in small sizes. For cold Kamik is good. Sorrel is over priced garbage.
Hand and foot warmers are worth it with kids, as are good mittens. The Obermeyer mittens tht Velcro in the back are easy with toddlers, around age four they are no longer worth it.