#asktheexperts hello mam .. I have a query regarding vaccination of my twins baby boy child. At present they both are running on 1 .3 months and all are fine.when of my child were 9 months old I had vaccinated at Delhi aiims with only MR vaccine .now they are about to turn 15 months old , can I administer MMR vaccine instead of MR vaccine ?secondly if we give our children the MMR vaccine, will the manufacturer be the different from the one that introduced MR vaccine which I had administered to them aiims Delhi when they were 9 months old . Third ,I had given one dose of hepatitis A vaccine at 12 months old so second dose of hepatitis a will be needed if yes when I can give them to which age. Thanks Regards Nitin Mishra