If we're going to talk about voluntary sterilization—or even the simple act of opting to have few or no children—we've got to get everyone on the same historical page. While I tend to take for granted that people understand the history of forced sterilization in the U.S., as well as countries such as China that mandate single-child families as part of population control, it may not be a given that everyone understands the connections between modern eugenics, race/class/ability privilege, reproductive justice, and the struggle for voluntary sterilization. Much as I know loads of folks use it as a jumping off point, skimming the Wikipedia entries for compulsory sterilization and eugenics in the United States only gets you so far.
When I think about the idea of celebrating children, I come back to the same question again and again: Why shouldn't an intentional choice be celebrated? When feminists talk about reproductive justice, it's often within the context of not just the ability to, say, have an abortion, but to raise a child the way you see fit, or to give birth on your own terms. The very notion that we should be in charge of our own bodies—that if possible, we shouldn't just wait for things to happen to us—is central to a conversation about rights, health, and justice. Don't you think intentionally opting out is worth a few streamers and noisemakers too?