The simple answer
These diseases are preventable. Vaccinate, and you can prevent your child suffering at all.
Vaccines are not made for trivial diseases that are easy to treat. To see a video of what a vaccine preventable disease can look like please watch this baby with whooping cough. This is no ‘right of passage’, but an unpleasant, painful, and life threatening disease that is preventable by vaccination.
There are, very rarely, serious adverse reactions to vaccines, but they are far far less common than complications of the diseases that they are preventing. For a table that compares the risks have a look here.
Page reviewed November 2018.