Here is a great article cutting down, fairly, American libertarianism, the extreme free market, hyper-individualist philosophy of Big Business:
https://www.counter-currents.com/2017/11/the-moral-poverty-of-libertarianism/
The article quotes from Murray Rothbard’s The Ethics of Liberty:
https://www.amazon.com/Ethics-Liberty-Murray-N-Rothbard/dp/0814775594
where in chapter 14, “Children and Rights,” he says: “the parent should have the legal right not to feed the child i.e. allow it to die.”