To be perfectly honest, with the first four there as no higher well informed decision making going on. It is just what people did.

I started delay vaxing following my nieces passing using less than 24 hours after her 2mo needles. She was the first of the kids in my family to get the new infanrix hexa that they started using in NSW and I simply could not bring myself to let them stick it in the arms of my 2mo baby. They couldn't find proof that it contributed, but they couldn't find proof of anything, so that is not proof that it didn't contribute, iykwim.

Anyway, I didn't even look into vaccines until after that happened. I was just being a good lemming. And on that part, you can quote me, lol.