If the mother worries greatly, or thoughtlessly "gets very angry" just before the nursing hour, there is a substance known as "epinephrin" secreted by the glands located just above the kidneys which is thrown into the blood stream and which raises the blood pressure of the mother and often produces not only colic in the babe, but many times throws him into severe convulsions.
"The Mother and Her Child"
William S. Sadler Lena K. Sadler