I’m due to have my baby in March and I want to use the Tommee Tippee swaddle bags. They come in tog ratings of 2.5 (all year round/ 20-22 degrees), 1.5 (16-20degrees) and 0.5 for even hotter temperatures. I’m unsure which tog rating to get for a newborn born in mid March - also what is the normal temperature for room baby is sleeping in?