Because parents have found their hearing child can communicate with them much earlier through signs than speech. The infant/toddler can make his needs known and the parents do not have to guess why their child is crying or what he is pointing at. It reduces frustration for both parent and child and makes for a much happier and contented child. (and parent!). Speech doesn’t usually begin until between one and two years of age. A baby can sign before he is one year old. The research on these families is showing that these young children’s IQ scores and cognitive skills are in the 99 percentile! It seems they are stimulating both sides of the brain and are getting a big jump start on language and communication. Hmmm, are we missing something? Should that tell us something?