Send your little one to the land of nod with this snug and secure sleep bag from Aden + Anais. One pre-washed 100% cotton muslin sleeping bag, single layer Breathable: helps reduce the risk of overheating Safe: replace loose blankets for safer sleep; British safety standard approved Easy: zips open from the bottom for easy nighttime changes Machine washable: stays soft wash after wash 1.0 TOG: suitable for rooms with ambient temperature of 24-27°C. Size guide: 0-6 months 58-71cm / 6-12 months / 66cm-79cm /12-18 months / 76-86cm /18+ months / 89-97cm.