Lots of studies have shown Sign Language to help young children with their overall language abilities. Kids who learn Sign Language often have a larger spoken vocabulary at an earlier age. It will give him an alternative way to communicate and may help him to increase his verbal skills. There are many baby Sign Language books and DVD's avaialable... I would encourage you to look into buying a DVD or even taking a Sign Language class (you can often find them at local community colleges for pretty cheap).