Is this the article you mean, Grinity?

Delay Kindergarten at Your Child’s Peril
By SAM WANG and SANDRA AAMODT
New York Times
September 24, 2011
http://www.nytimes.com/2011/09/25/opinion/sunday/dont-delay-your-kindergartners-start.html

The authors are neurologists and recently published, Welcome to your Child's Brain. There's a bit of debate about this article on this forum:

http://giftedissues.davidsongifted....rting_and_grade_skipping.html#Post112399