To Elizabeth Peyton--
The reference, sort of, from Niles Newton, (PhD, not MD, that's Michael)--
In "Newton on Breastfeeding, Reproduction of Early Classic Works by Niles
Newton with Michael Newton and others" Reprinted by Birth and Life Bookstore
in Seattle--

From Clinical Obstetrics and Gynecology, Vol. 5, No. 1, pp 44-63, March 1962:
"The Normal Course and Management of Lactation"
Michael Newton, MD, and Niles, Newton, PhD, Dept. Ob Gyn, University of
Mississippi School of Medicine

In the section of this article on factors influencing lactation, sucking
stimulation:
"Recently we received a well-documented report of a 60-year-old Mississippi
grandmother who decided to adopt and nurse her grandchild when her daughter
died. The milk appeared as expected, and the child was breast fed until he
was able to walk."

Unfortunately, this is not further described nor referenced.

Nevertheless, it does not seem unlikely, given our understanding of lactation
physiology.
Lactation suppresses ovarian function (ovulation), and it doesn't seem that
the ovaries do much for lactation during lactation (assuming breasts had
normal estrogen stimulation initially.)

Tina smillie