Second hand obsession!

So I know I'm not poor at all. I've got savings and I rarely go without but I seem to be very stubborn when it comes to purchasing for this baby. I don't see the point in buying brand new things when I only plan on having one and they grow so quickly in the first few months. I've bought everything second hand. Bath, crib, diaper bin, steriliser, breast pump... Just everything. Is there anything I should be wary of buying second hand though?
I know I will buy myself new bottles and a crib mattress, but is there anything else? 
I know I sound cheap 😣