Are you familiar with Kathy MacMillan's incorporation of sign language into library storytimes? http://kathymacmillan.com/
What about pairing this rhyme with "Itsy Bitsy Spider" ... even in baby programs?
What about using the following signs as you present "Jack Be Nimble" to babies and toddlers? Even if they aren't making the signs themselves, the motion will keep their focus on you as the presenter:
(Having trouble emedding the videos ... Please follow the links.)