research shows that sign language can help children's learning ability to grow. with just a few simple american sign language signs, babies and toddlers — some as young as nine months old — can show people their needs before they can speak, which may make them have fewer temper tantrums, even if they have disabilities. school-aged children enjoy the benefits of learning a second language. children with developmental delays or special needs can find their own “voice” by using their hands to talk using sign language.