From a textbook on the development of the human brain:
“Lip tactile response may be evoked by the end of the seventh week. By 10.5 weeks, the palms of the hands are responsive to light stroking with a hair, and at 11 weeks, the face and all parts of the upper and lower extremities are sensitive to touch. By 13.5 to 14 weeks, the entire body surface, except for the back and top of the head, are sensitive to pain.
Reinis, S., and Goldman, J.M., The Development of the Brain, (Charles C. Thomas, Springfield, Illinois, 1980)
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