Fetal pain - as early as 20 weeks

From Physicians for Life Fetal Pain: The Current Evidence:

"...when pain is defined as a higher-order process, it is conceivable that a fetus experiences pain at 20 weeks, which is when thalamic connections are completed, based on observations of anencephalic children with intact brainstem and thalamus. By 24-28 weeks, it is even more certain that pain experience is possible, as this is when the cortical connections are complete..."