While nitrous oxide is not yet mainstream in the United States, it is not a new method. It has been used during labor for more than one hundred years across the globe. Nitrous oxide is routinely used in Canada, Sweden, Australia, Finland, and the United Kingdom. While studies on nitrous oxide usage specifically based in the United States may be limited at this time, nitrous oxide has been widely recognized as safe to mother and baby. In most cases, nitrous oxide does not come with significant side effects for the mother, either. Any possible side effects are usually minimal and can be quickly resolved.