N.S.
I too am a mommy of a 2 year old, none on the way, but I suffer from CFS, so it's always a struggle to keep my energy levels up. I have the opposite problem in Texas, it's too warm, we don't experience that seasonal shift in the fall (I'm a NorthEasterner) so I feel very imbalanced in the winter months because it isn't cold enough and snowy and you don't see that transition so obviously. I feel cheated and sad....literally, probably sounds weird, but I do.
We had a couple weeks of bitter cold, freezing temps (which I LOVE at least for part of the year) and now it's been back to 70-80 degree temps and sun already, like summer. Again, no seasonal shift, just sudden and it really messes with me.
Anyway, for me, cold or hot-I have to make myself get out of the house. Bundle up and take a walk even, anything. Go to a zoo, or park, or garden, whatever is available for good, cheap family fun. Walk around, get fresh air. We go for a family bikeride every weekend, warm or cold-it's great for the mind and body. I organize too, take a box or whatever that needs to be cleaned out and watch a favorite movie while going through it and eliminating some junk. I find that when I prioritize and keep the house clean and organized as possible, make sure that I make time for exercise, be it dancing around the house with kiddo or actually going for a walk or to the gym-my mind stays more clear.
Work on new stuff for baby, nest, fold little clothes, whatever you need to do in preparation. Even coloring with the kiddo helps sometimes. Open up all the curtains or shades and let light in, take 10 minutes and deep breathe, find a great book to dive into. All things that help. Winter will be over soon and your new little addition will be there to brighten things up! Best of luck to you!