Dear Paul and Anabel:
I did not read the Scientific American article you described.  However, a
couple of years ago Society for Research on Child Development published a
monograph on the effects of early supplemental feeding.  It sounds as though
it was from the same study.  I too was really aggravated that there was no
mention of breastfeeding as a possible feeding method, or no reference made
to increases in cognitive ability among breastfed babies/children.

My field, developmental psychology, has been very slow to acknowledge
breastfeeding.  I attended an infant mental health conference last summer.
 The keynote speaker talked about mother-infant interaction, maternal
responsivity and sensitivity, etc...  when he talked about observing
mother-infant "feeds" I suspected that he was not talking about
breastfeeding.  I later confirmed this by asking during the break (I asked
nicely, really!).  He told me that he had NEVER studied a breastfeeding
mother.

My colleague Muriel Sugarman likes to bring a book along when she gives
talks.  It's on the "Psychobiology of attachment" and there is not a single
reference to breastfeeding.

Kathy Kendall-Tackett