What is the name of mercury free vaccine given to babies at 2,3 and 4 months old . Does anyone know ? My DD has just gotten 1 set of jabs , unf. containing thiomersal ( mercury .. ) but I wanna make sure that next time it is not gonna happen. Why on earth the doctor said nothing about dangesrs of giving babies such a big dose of mercury in one go ? I only realised how dangerous it is after reading few messages at mumsnet ( go to health then discussion about vaccines ... ) and checking internet .