I use the same method with my DS. My brother has Downs, so thought it would be great to teach him early. We started around the 8 months mark and now at 18mths he does use them alot. Its great, espec the finished and more, makes meal times so much easier. He also like the animal ones, if he hears a bird outside he will make the sign for it, and gets so proud of himself for it All the best, its a great tool for both of you.