There are few research that says painless vaccines if given at 6, 10 and 14 weeks have lesser immune response ( lesser protection) than painful once. As per standard guidelines initial vaccines should be painful one and subsequently painless can be given. Don’t worry there are lot many parents and physicians who still give painless vaccines to their kids. These reports are from western world where diphtheria and pertussis is coming back in adulthood. The effect of same in Indian scenario is still not clearly understood.

It is a myth that painless vaccines are ineffective. If that was the case why would your doctor recommend it in the first place or why would these vaccines even be available? The vaccine that you have mentioned is probably Prevenar, which provides protection against 13 subtypes of Pneumococcal bacteria. That is always painless. There is no painful vaccine against Pneumococcal bacteria.