Depending on the temperature of the room your baby sleeps in, you can adjust the tog of their grobag to keep them comfortable. The higher the tog, the warmer the baby sleep bag, Grobags come in 0.5 tog, 1 tog, 2.5 and 3.5 tog options.
Winter Warmer Grobag
Winter Warmer 0-6 mth 3.5 tog...
Winter Warmer 6-18 mth 3.5 tog...
Winter Warmer 18-36 mth 3.5 tog...
To help you pick the right Grobag use this handy tool!