Malabar Baby Handmade Sleep Sacks provide a safer sleeping environment for infants, offering a secure and cozy alternative to traditional blankets in the crib. Highly recommended by pediatric sleep consultants and parents worldwide. We've made things simple, choose Tog 2.2 for room temperatures between 64-70°F / 17-23°C and don't forget to pick our organic cotton PJs or Onezip romper to complete your bedtime look! Please follow our size chart to get the perfect fit for baby. Don't forget to measure your baby's length (Chin to Toes) before purchasing for the best fit. Quilted - Tog 2.2 (Winter/Ac Use) Recommended room temp 64-70°F / 17-23°CSmall: Fits newborns-babies 6 months | 7-18(lbs) / 3-8(kg)Medium: Fits babies 6-18 months | 16-26(lbs) / 7-12(kg)Large: Fits babies 18-36 months | 25-35(lbs) / 11-16(kg)Extra Large: Fits babies and toddlers from 36-48 months | 34-45(lbs) / 15-20(kg)