Ds1 turns four in a little over a month. He does not start kindergarten though til Feb 2012. Ive been thinking about delaying the vaccination til Sept next year instead but Dh is not keen on the idea, saying they have the schedule for a reason. He does attend preschool and will until he starts school.

Is it really neccesary to vaccinate on schedule or even have this particular vaccination at all? Will his immunity be compromised because its given late? Can the preschool or school deny us access because its been delayed?