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The award-winning 4 Season Ultimate Baby Sleep Bag keeps your baby at a perfect temperature throughout the night year-round. That means theres no need to worry about which weight sleeping sack to use or whether your baby will be too hot or cold while sleeping C theyll always be just right! Made with super-fine and supremely breathable merino wool it helps keep your baby warm when its cold and cool when its warm. That temperature regulation means that your baby will sleep comfortably throughout the nightC and that means a better nights sleep for you too. It comes in a universal size that fits babies from 2 months to 2 years. So instead of buying a different sleeping bag for different seasons as well as buying larger ones as they grow you just need one Woolino sleep bag for your baby right up until they turn two!