Children today receive WAY WAY more vaccines than you and I did as children. I am 48 years old.
In some places like the USA, they even give a Hepatitis B vaccine to a baby only hours after birth!!
And then they get more at 2 months, 4 months, 6 months, etc ... several needles containing multiple vaccines each time.
Vaccinations are a pharmaceutical drug. ALL pharmaceutical drugs have listed and potential side-effects. The more you give, and the younger the ages you give them, the amount of damaging effects will greatly increase.
There was vaccine injury when you and I were young, but with so few vaccines, and given later in life, those number of damaged people were incredibly less than we see today.