I think maybe not if you sign them up for cryonic preservation?

I think it may be much more on point to talk about it being unethical to have children pre-singularity, for the inevitable needless suffering that will occur. I do believe that the moment we solve aging, it is a moral imperative to stop having children until we can be assure that we're not bringing new people into existence just to suffer.

I don't think it is unethical to keep having children today, but only so far as it is necessary to actually reach the singularity. I think ethically, we should be trying to minimize the portion of human mind-space that must experience pre-singularity existence, but not to the point of delaying the singularity.