Vaccinations...

I got into an argument with the girl at work over this. Her friend had a baby who's is 4 and she claims that the baby was perfectly normal until she got vaccined & now she has down syndrome. No she told her mother don't you wish you would listen to me now your child has Down syndrome. I told her she can't blame the mother for doing with that she thought was right. She said that her child is not vaccinated and is perfectly fine. I never thought of it until that argument so I started doing research and now I'm wondering if all the vaccinations is really necessary.