Are the parents planning on doing (baby) sign language? If not, a book on how to do that would be, in my opinion, the best thing you could do. I don't know wh

Are the parents planning on doing (baby) sign language? If not, a book on how to do that would be, in my opinion, the best thing you could do. I don't know what the latest research says about later brain development with early sign language learning, but I do know that teaching our kids baby sign language from birth certainly cut down on frustration as a parent, as we were much more likely to understand what the baby wanted/needed. It's also a serious trip to see a 1 year old kid doing sign language.