The Baby Tuck Sheet is a TOG-rated, safe alternative to blankets suitable from birth. Designed to use over the top of a swaddle or sleeping bag, the Baby Tuck Sheet is a firm-fitting mattress sleeve that provides added security and comfort for a newborn during sleep. Each side of the Baby Tuck Sheet is TOG-rated; simply flip the sheet over to adjust the warmth and follow our Bedding Temperature guide (included) for help layering. The zips allow you to adjust to two levels of firmness (tightness), to find the perfect fit for your baby's size, or strength of startle reflex.