What could be a good guideline to follow if ever I choose to immunise?

Give children vitamin A after receiving the pertussis (whooping cough) and measles vaccines. Give children a dose of vitamin C before and after receiving any vaccine.  Except for very premature babies (say 28 weeks or 1 kg), vaccines should be administered by gestational age (birth date) not chronological age (due date) — as that relates to how long their immune system has been functioning outside the sterile womb. If the baby is ill or sickly, delay vaccines until they are healthy — with the exception of the vaccine that includes whooping cough (pertussis) because this is such a nasty disease for a wee baby to experience. Further guidelines are indicated in page 356.