The pregnant woman's diet and stress level in particular provide important clues
to prevailing conditions like a finger lifted to the wind.
整个段落是这样的：
So what a fetus is learning about in utero is not Mozart's "Magic Flute" but
answers to questions much more critical to its survival. Will it be born into a
world of abundance or scarcity? Will it be safe and protected, or will it face
constant dangers and threats? Will it live a long, fruitful life or a short,
harried one? The pregnant woman's diet and stress level in particular provide
important clues to prevailing conditions like a finger lifted to the wind. The
resulting tuning and tweaking of a fetus' brain and other organs are part of
what give us humans our enormous flexibility, our ability to thrive in a huge
variety of environments, from the country to the city, from the tundra to the
desert.