If you begin signing with the infants in your care you may want to explore this website a bit. The site is definitely selling a product but in my opinion, you don’t really need any more than what is available for free. There are videos showing babies signing, examples of how to teach the signs, and flashcards organized alphabetically so you can look up a word or idea based on your own particular needs. Although this month I am focusing on signs that have mathematical meanings, there are all sorts of signs available on the site that will encourage vocabulary growth, labels for common concepts, and signs that allow an infant to communicate feelings.
There is nothing like offering the fruit bowl to a preverbal infant and then asking what he wants for a snack and watching him sign “Apple”. Amazing.