1.1 tog - perfect for warmer months to keep baby comfortable and cool! Our sleep bags are designed to make sleep safer and more comfortable for your baby. The lightweight and breathable cotton muslin helps prevent overheating and allows baby to move naturally. Included are parent-loving features like a two-way zipper for easy nighttime diaper changes, and machine washable cotton muslin that gets softer with every wash. Babies come in all shapes and sizes. Please reference our size chart to help you find the proper size for your baby. Size Baby Weight Baby Height Baby Age Small 10-18 lbs 23"-26" 0-6 months Medium 16-24 lbs 26"-30" 6-12 months Large 20-28 lbs 28"-32" 12-18 months X-Large 27-30 lbs 30"-35" 18-24 months Check out my closet for additional items to bundle and save!