There are many reasons to choose to live child-free. Some very valid reasons are overpopulation, living with a smaller footprint on the planet, and not wanting to raise fodder for the war machine. Choose from these t-shirts and get the word out.
Brightly colored bird and words "Child-Free means free to be me" gets the message across that choosing a child-free lifestyle has benefits those who breed give up for the rest of their lives.