Once your baby is ready for the bigger Zipadee-Zip, you won’t have to sacrifice quality or safety. Rest assured, our sleepwear is not treated with chemical flame retardants but still adheres to strict United States safety standards. We meet the government’s standards by using a proprietary blend of fibers that are naturally flame-resistant, but this does mean that certain sizes (medium and up) are not 100% cotton. At Sleeping Baby, we are proud to comply with baby safety standards without using any chemical treatments on our products.