My husband doesn't want our 18 month old to have the swine flu vaccine.....?

You have a problem, he probably thinks his reason for not wanting this vaccine protects his child, just as you think having it protects the child too. A compromise is needed. Perhaps a visit to the doctor to discuss it, and any misgivings people have about it. I would hate to be the parent who refused a vaccine, only for the child to later get the illness and suffer seriously because of it.