I am a 51 yr old mother of 6 children. My oldest is 29, my youngest is 6. All of my children have been vaccinated, but I chose to vaccinate them when they were around 4 years old. The reason is  because of how they have been preserved .  Honestly , I'm not positive that they still do this , but in the past the amount of Mercury used to preserve just one shot given to a child contains the maximum allowable amount of Mercury for an adult. And children generally get 4 to 6 shots at each sitting. This means that they have been exposed to up to 6 times the amount of Mercury that is consider safe for an adult.
I have known at least 4 children who were clearly injured for life due to the vaccination they received . It's scary. I think that it would be safer to give fewer shots at a time and start the cycles later in life.