A document called "Infinite Dignity" details what the Vatican sees as grave violations of dignity. Poverty, war and the abuse of migrants lead the list.

Michigan was the last state to criminally ban using a paid surrogate to have a child. Now that will change under a law signed by Gov. Gretchen Whitmer on Monday.

The pontiff called surrogacy "deplorable." But one U.S. surrogate said the practice helps those who are unable to have children start a family.

There's a well-established industry centered in California that provides surrogate births and attracts Chinese mothers to the U.S. to engage in what's known as birth tourism.