I used baby sign with Matilda and Jovie when they were 6months-18 months. I taught them basic basic signs, like "Eat" "drink" "more" "stop" and "finished" so we could get through basic barriers with less tantrums. Matilda loved them, she used them all the time, and even now she'll use our sign for "finished" if she thinks I haven't understood her words. I still use the sign for finished when I'm trying to get the to understand that there isn't anymore of some food item that they are screaming for