A decade ago, if you'd seen a baby using sign language with her parents, you probably would've assumed the baby was deaf. Not so these days. The number of parents enjoying the benefits of signing with their hearing baby or toddler has mushroomed in the past 10 years. But why use sign language to communicate with a child who can hear - and is learning to speak anyway?

Want to learn more about Glenn Doman and his methods? Read the history of Glenn Doman and how the institutes for the Achievement of Human Potential lead to the discovery of early learning.