OP, if this was say a party for a 5 year old and people invited were school friends whose parents you don't know overly well I would say no, don't send the poem. As this is a party for a 1 year old I would assume the majority of the guest list are close friends and family (of your husbands?) I know my close friends and family would be more than willing to help out of we were in the same situation as you.