Dd2 sleeps in one of these and has done since she was tiny. Have just bought her an 18-36 month size, but have been wondering about what will happen when she goes in to a bed (which will probably be in the next 6 months or so).
How did your children cope with a duvet or blankets for the first time? Did you encounter any problems? My dd moves around A LOT in her cot, and I often find her facing the opposite way round to how I left her in the morning. I just wonder if she will get all tangled up in a duvet or lose it completely in the night and get cold. I never used them with ds and dd1 so they were used to duvets/blankets already.