I started watching Baby Signing Time! DVDs when my baby was about four months old. I'd learn the songs and signs from the videos and then sing and sign them to my daughter. I liked it so much, I made American Sign Language songs (like Apples & Bananas and Baby Needs a Diaper Change) a regular part of my Infant Story Times at the Burien Library.
Looking back, I think learning ASL was one of the best things I did in my first year of parenting. Here are some of the great outcomes we experienced:
Easing frustration when baby wants something. She doesn't just cry and point. She can usually tell me exactly what she wants by signing (usually it's milk, of course).
Bonding and celebrating when she learns new signs. The first time she signed "mama" my heart was so happy (she signed it way before she could say it).
Knowing that singing and talking are helping develop early learning skills. There's research that shows amazing benefits when caregivers sing and talk to their babies (in addition to reading, writing and playing).
If you're interested in learning more about using ASL with your child, here are some resources:
Baby Signing Time Preview: