The Ultimate History Project has a brief interesting article on the mixed heritage and results of Better Baby Contests that were all the rage just about a century ago. Babies were weighed and scored on a number of supposedly scientific criteria; often there was an anti-immigrant or anti-black subtext to the movement at a time when eugenics had not yet become a dirty word.
But genealogists devour everything. These contests are another potential source of information, as contestants and winners were sometimes pictured and identified in local newspapers. The above article about a Missouri contest appeared in the Quincy (Illinois) Daily Journal in 1915 -- thanks to the Quincy Public Library's awesome newspaper archive. I have seen BBCs with pictures spread across an entire page of a small-town newspaper.
Rachel Louise Moran, "Making Perfect Children," The Ultimate History Project (http://www.ultimatehistoryproject.com/better-babies.html : accessed 25 March 2013).
"Additional Awards in Palmyra Round-Up," Quincy Daily Journal, (Quincy, Illinois), Thursday 23 December 1915, p. 8; digital image, Quincy Public Library Newspaper Archive (http://www.quincylibrary.org/library_resources/newspaperArchive.asp : accessed 26 March 2013).
Harold Henderson, "Was Your Ancestor Entered in a Better Baby Contest?," Midwestern Microhistory: A Genealogy Blog, posted 28 March 2013 (http://midwesternmicrohistory.blogspot.com : accessed [access date]). [Please feel free to link to the specific post if you prefer.]