I'm trying to figure out how to keep Baby M(the fulltime 18month old I babysit) warm but still go outside. My winter coat won't fit over both of us when I carry her. I can put my coat on and front carry her and layer her with heavy pants, and a sweatshirt and wrap her in a thick blanket but that leaves my coat open and I'm not sure if she's warm enough and honestly she's 23lbs and front carry is hard so I prefer back carry. I've heard don't use coats with carriers but I'm wondering if I get her a snowsuit to wear like this if that would be ok or not or what I can do for her.
Or is the Ergo like a car seat where I don't want to use puffy coats and snow suits between her and the straps of the Ergo? I'm thinking me wear my coat and put her in a snow suit and in the Ergo back carry. I can get the Ergo winter cover and use that but I'd like to not charge her mom the $40 for it(she wants the baby carried and not in a stroller so she supplies the things I need to carry her). I know she doesn't have that kind of money laying around so I'd like to go as cheep as possible. Should I get something more like this where it's fleece and thin enough for the car seat, and still wrap her with a blanket?
How would I do that back carry and put a blanket on her?