Science now shows that unborn babies can feel pain by 20 weeks post-fertilization, and most likely even earlier.
The first requirement for fetal pain perception is the presence of cutaneous sensory receptors, which begin to develop in the peri-oral area at seven weeks and spread to the palms and soles by 11 weeks. Early in the second trimester, the fetus reacts to stimuli that would be recognized as painful if applied to an adult human, in much the same ways as an adult, for example, by recoiling.
Fetuses can be seen reacting to intra-hepatic vein needling with vigorous body and breathing movements, increased heart rate, and increased blood flow to the brain. There are many instances in medical practice in which doctors take extra precautions to prevent pain in human beings by administering anesthesia to those who have experienced brain death, are in a vegetative state, or are being given the death penalty.
However, this same precautionary use of anesthesia is not extended to unborn children who are being aborted by brutal abortion procedures, such as the most practiced second trimester abortion method of dismemberment where a child is literally torn limb from limb in the womb. This is a grave injustice.