Babies who use sign language tend to speak sooner with larger vocabularies, show an increase in IQ scores and engage in more sophisticated play.  Preverbal signing has also been shown to reduce the frustration broadly associated with “the terrible twos.” MORE...

Babies Are Talking With Their Hands Before They Can Speak!
All babies use their hands to communicate before they can speak, such as waving bye-bye and clapping. Research shows that babies can learn to communicate using sign language as early as ten months old, well before their vocal capacity to formulate spoken words is developed. MORE...