Overheard-Dry Ice

Overheard today while sitting outside:

A woman talking with a Fed Ex driver about how the next shipment will require 2 trucks… and that every package will be sealed with dry ice. He complied, and said, that shouldn’t be a problem…

Why is this odd?
The woman than walked inside and towards the area that a company that harvests umbilical cords is at.

What in the world are they shipping that requires 2 Fed Ex trucks filled with boxes that will all be carrying dry ice?