This section is from the book "The Hygienic System: Fasting And Sun Bathing", by Herbert M. Shelton. Also available from Amazon: The Hygienic System Vol III Fasting and Sun Bathing.
The subjection of a pregnant woman to daily sunbaths will benefit both her and the developing foetus, and I am convinced, will also do much towards lessening the pains that now make childbirth a harrowing ordeal in so many cases. Sufficient sunshine during pregnancy will not only produce better general health in the mother and better development in the child, but it will prevent the loss of so much blood by the mother. Girls brought up in the sunshine, properly fed, and normally active, should develop so well that normally painless childbirth should be the rule instead of the now rare exception. It is worthy of note that those mothers who are in the sunlight the least are the ones who have the most difficult deliveries in childbirth. The unclad races have the easiest deliveries.