What are baby items that I shouldn't buy used?

I'm trying to save money and buying new is very expensive. I don't know many people in my area either so I won't be having a baby shower. What are items that I should get new due to safety and maybe just because buying used might be gross? I'll edit them into the list when I get some responses. Thanks so much!!

To purchase new:

Car seat

Mattress

Pacifiers

Breast pump

Crib

Bottles