I think it is a great idea and wish I had started sooner! Friends of mine have been doing it since around 6 mths and he knows a few things but is still learning (he is nearly 12 mths) Iz has just recently started doing these hand signals for everything, it means "give me water" "pick me up" "get me off my bike" "I dropped it and don't know where it is" etc!! It is really cute and great because it is another way she can communicate with us and her language skills are a bit behind for her age! Good luck with it - I might have to go check out our local library!