I disagree more with this statement than any other statement ever made in good faith on Hacker News. Kids not dying is an outcome we urgently desire, right? There are a variety of products which support this outcome. One is "soap." Soap scarcity is a real phenomenon: some rooms that children are born in have no soap. Those rooms kill lots of children. Soap scarcity was a quite common phenomenon until very recently, historically speaking. The reason that I keep having to mention that soap scarcity is a thing at all is that market mechanisms are so effective at allocating resources to production and distribution of soap that educated Westerners could be forgiven for not knowing that it doesn't come from the same magical fountains supplying the infinite, free, clean drinking water often found co-located with infinite, free, effective soap.
In the real world, some kids will die this year for want of soap. Some people believe this is because the market has taken the soap from their rooms. These people are fools, because the natural state of nature is "no soap." Children die because, almost universally, someone has strangled the market that would otherwise be allocating soap towards their rooms.
There are more complicated reasons for child morality than lack of soap, but to the extent that they involve scarcity of resources, they largely reduce to the soap case.