A controlled study in 2013 by researchers in Hertfordshire, England used better scientific methods in order to determine the effects of baby sign on language development and on the mother-child bond [2]. Dr. Elizabeth Kirk and her team wanted to study this topic in order to provide sound evidence regarding the usefulness of baby sign products and classes. They studied forty babies (and their mothers) from age eight months to twenty months. The babies were randomly divided into groups, and the mothers in each group were instructed to either