But there are lots of things that are good and moral to offer that aren't human rights.

Yes, societies around the world still have lots of improvements that can be made, and probably can keep improving forever.

I'm not convinced that moral and good is the criteria by which something is deemed a human right. Especially considering that "moral" means wildly different things in different cultures and "human rights" span the totality of humanity.

How about the other option?

>What is the minimum quality of life you want for your children?

I think that's a good question since pointing to references is a powerful way to make an argument. Although not legally binding, the UDHR contains this:

"Everyone has the right to a standard of living adequate for the health and well-being of himself and of his family, including food, clothing, housing and medical care and necessary social services, and the right to security in the event of unemployment, sickness, disability, widowhood, old age or other lack of livelihood in circumstances beyond his control."