ergo Pouch Swaddle 0.2 TOG Size 000 Newborn 0 months - 3 months Weight 3kg - 6kg Height 62cm Dragonflies Light Blue Sky Blue Babies are sensitive to heat, so if you live in a relatively new, well-sealed home, you should be able to use this without any problems even in winter. In winter, you can wear it over long-sleeved underwear, and in early spring, you can wear it over short-sleeved underwear. There are clothespin marks on the bottom, so I'm selling it at a reduced price. (They might come out in the wash.)