After the swaddling phase is over a sleep bag is ideal for baby's sleep environment. Slim fit and stretchy design the Ergo Jersey Sleeping Bag is recommended as baby's first sleeping bag. Soft, stretchy GOTS certified organic cotton and bamboo viscose blend is gentle on skin. The design features a bell shaped bottom to promote healthy hip development and earns a seal of approval from the International Hip Dysplasia Institute. The 2.5 TOG Jersey Sleeping Bag is perfect for keeping a child warm overnight in rooms 17-23 degrees Celsius / 63-73 degrees Fahrenheit. The TOG rating means that there is no need for additional blankets in the crib when using this product, making it a safe-sleep option. Parents can rest assured that the breathable organic and natural fibers will help regulate their child's temperature and prevent overheating. Parents can follow the FREE room thermometer and What to Wear guide provided with the product, to layer appropriately underneath to keep their child warm. The Jersey Sleeping Bag complies with AU, US, UK and EU safety and quality standards and is reviewed by the National Eczema Association as a skin-friendly product. All ergoPouch fabrics are dyed with non-toxic water based dyes.