Vaccine doses have increased dramatically since the time that most of today's parents were children. As doses have grown from 5 shots in 1962 to 24 in 1983 and 72 today, children must now get 4, 5 or even 6 shots in a single doctor's visit.
Most of the increase occurred after Congress passed the National Childhood Vaccine Injury Act in 1986, which removed liability from vaccine manufacturers, transferring it to taxpayers instead. The act created the National Vaccine Injury Compensation Program, paid for with a portion of the fee that doctors charge for each vaccine.
Vaccines are now very profitable for the pharmaceutical industry. The 1986 act means that manufacturers bear no liability costs and have little incentive to do more than the minimum testing to get FDA approval. Manufacturers also have low marketing costs as the CDC markets for them by adding the vaccine to its schedule. It's little wonder that there are over 200 additional vaccines currently in the works.
Check out the CDC vaccine schedule for both children and adults. Note that at the vulnerable age of 2 months, babies are expected to get a total of 6 shots. These 6 shots all contain aluminum and other ingredients that may be below the FDA toxic limit individually, but not collectively.