Baby sign language gains popularity but some are concerned

"Some parents worry that introducing signs or gestures competes for a baby’s attention and working memory and that it can potentially interfere with spoken-language learning. But the most widely cited research shows the opposite to be true. 'When a baby learns to crawl, it doesn’t slow down [the process of] learning to walk. It gets them excited to move around,' said Linda Acredolo, a psychologist and retired professor from the University of California at Davis." Read more at the Washington Post