@Gentile
In my copy of N&PD, Price refers to a woman and her two children- the first born on a Western industrialized diet and the other on a superior traditional diet. Entirely different developments and birth. This is in the chapter titled “Application of Primitive wisdom”. I can’t find it in my (newer) editions but I distinctly remember an older edition containing a similar story but the mother was Polynesian and had children on and off a traditional diet, with obvious differences.
There are also people who’ve been on a Price diet and have recorded their own experiences with reversing abnormal development through diet. Nourishing Our Children has two articles on their website- The Tale of Two Brothers and Reverse The Trend.
I remember a while back a woman in a Raw Primal Diet facebook group showed her children- the first daughters are underdeveloped and unhealthy, and the later children raised on raw diet and WAP diet are significantly improved in their development.
“ The normal determining factors that are of hereditary origin may be interrupted in a given generation but need not become fixed characteristics in the future generations. This question of parental nutrition, accordingly, constitutes a fundamental determining factor in the health and physical perfection of the offspring. One of the frequent problems brought to my attention has to do with the responsibility of young men and women in the matter of the danger of transmitting their personal deformities to their offspring. Many, indeed, with great reluctance and sense of personal loss decline marriage because of this fear, a fear growing out of the current teaching that their children will be marked as they have been.”
Chapter 21- Application of primitive wisdom by Weston A. Price
You could also look at animal studies cited by Price wherein they removed vitamin A from the diet and piglets were born blind. Some mated those blind piglets and fed them vitamin A- which produced normal piglets.
“ Professor Hale reports that in April, 1935, a litter of seven pigs were born blind at McGlean, Texas, which was suffering from drought conditions, similar to those at Ralls. The litter and dam were purchased by the Experimental Station. Matings were made between blind pigs. These were fed rations containing ample vitamin A, and normal pigs with normal eyeballs were produced. Even the mating of a blind son with his mother who had produced him when on deficient diet, produced only normal pigs when both had ample vitamin A. He states, "If an hereditary factor had been the cause of this congenital blindness, these matings would have produced some blind pigs, even if vitamin A were present in the ration."