We started using ST DVDs with our eldest son when he was approximately 18 months old after having used very basic signing with him earlier. He LOVED the DVDs and learned the signs on Vols. 1-3 in less than two weeks! We have another son, now 17 months who loves ST as well. He is able to communicate with us and with his older brother. Despite reservations expressed by friends and family we felt this was a wonderful approach to language development for our hearing children. We were thrilled to have the new ST DVDs, Vols. 4-6. I have given Vols. 1-3 regularly as gifts to new parents. I cannot say enough good about these DVDs. Enjoy!!