Or they WANT them to feel pain.
In their myths, a woman explicitly incapable of knowing the difference between right and wrong strayed from absolute mindless obedience to sky daddy, so all women have to suffer forever, and anything that reduces that suffering is inherently evil for opposing the will of sky daddy.
Except the claim being studied is that Tylenol might cause autism when administered to the mother while pregnant. There are a lot of drugs that will cause a problem to a fetus when administered to a pregnant woman, but do not cause that problem when administered to someone outside the womb. Building a human from scratch is a fiddly process.