I don't get it. If the babies were vaccinated why was it necessary for the adults to be vaccinated too? (Especially if we're talking about HepB?)
A bit off-topic - I don't understand this "No Jab, No Play" phrase. I don't know about Australian schools, but around here kids don't actually have time to play while at school. They barely get a few minutes between classes and those minutes are spent running from one room to another and going over their lessons in case the teacher gives them a test. Doesn't sound like kids' play, does it?