http://health.discovery.com/centers/kids/babyfingers/babyfingers_02.html
Make eye contact
Speak while simultaneously signing
Sign while doing the action—for example, sign "change" when you're changing your baby, and "milk" when giving a bottle
Teach the signs to all the important people in your baby's life, like babysitters and grandparents, to keep the learning consistent
Show your feelings
Respond with excitement to his or her attempt to sign
Be attentive to your child's likes and dislikes, new interests, and favorite things, as they will often be the things your baby is most interested in signing