Intensive Care Unit physician Greg Schmidt, MD, from University of Iowa Health Care tests whether face masks impede your breathing or make you retain carbon dioxide.
There does not appear to be much scholarly research on children and masks. The following two articles were the most relevant items found during a recent, thorough search.
Most research on masks and limiting the spread of viruses has focused on the mask protecting the person wearing it. COVID-19 has changed that focus. The articles below are listed in chronological order, dating back to 2008.