B. G. Jefferis and J. L. Nichols, Searchlights on Health — Morning Sickness (1919)
“ MORNING SICKNESS is the most common and is the result of an irritation in the womb, caused by some derangement, and it is greatly irritated by the habit of indulging in sexual gratification during pregnancy. If people would imitate the lower animals and reserve the vital forces of the mother for the benefit of her unborn child, it would be a great boon to humanity. Morning sickness may begin the next day after conception, but it usually appears from two to three weeks after the beginning of pregnancy and continues with more or less severity from two to four months. ”
