Hi, I had gone through your question and understand your concerns. Whole cell DPT( DTwP) ( so called painful injection ) is slightly better or equal in terms of immunity for pertussis in long term , main reason for use of so called painless vaccine( DTaP) was due to less local and systemic side effects of pain , swelling , tenderness , fever and irritability . Moreover painless injections are in short supply ( not available ) presently . So in terms of effectiveness painful DPT is more or equal effective than painless DPT . Go for DTwP ( painful ) vaccine as suggested by your doctor , give baby paracetamol 6-8 hourly for 2 days to decrease pain and fever . Routinely I do recommend DTwP (painful ) at least for primary series of vaccines . Hope this answers your question. If you have additional questions then please do not hesitate in writing to us. •     DISCLAIMER: - All the information provided here is for information purpose only , it is not a substitute for the advice of a physician after physical examination , it is not intended to replace your relationship with your doctor. This information in no way establishes a doctor-patient relationship. Before acting anything based on this information do consult your doctor. I recommend that online users seek the advice of a physician who can perform an in-person physical examination