I have Logan's normal clinic book, and then an additional vaccination card (which none of the healthcare professionals seem to use), but according to that card, the first three vaccinations can be given at different times.
Option 1 (the usual one):
6 weeks
10 weeks
14 weeks
Option 2:
2 months
3 months
4 months
Option 3:
2 months
4 months
6 months
Maybe that is what your colleagues and friends are referring to?
Maybe that's how the Private clinics do it?
Or maybe that's how it "used" to be done.
But most of the clinics and paeds say 6, 10, 14 weeks, then 9 months. That's the route we're going.