At around 16 months of age, I began teaching Luke sign language. I thought it would be hard and I didn't quite know how to start. It didn't take long and was somewhat simple. Then I was hooked and wanted to learn more. The first thing Luke learned was "More" and "All Done." He used them for all kinds of things, not just eating. Now he knows so many and is still learning. This are some of the things he can sign at 20 months. More-All Done-Cracker-Eat -Drink-Potty-Mom-Dad-Milk-Drive-Play It is a wonderful thing to be able to communicate without having to hear whining.