> The first study I linked accounted for maternal IQ:
> In an ordinal regression model, markers of neurological development (cognitive test scores) and stress (emotional stress scores) accounted for approximately 36% of the relationship between breast feeding and social mobility.
That quote is referring to the baby's cognitive test scores, not the mother's.
Also: http://www.ncbi.nlm.nih.gov/pubmed/10224215 ("Significant relations between breastfeeding and Woodcock Reading Achievement scores at 11 years were also reduced to nonsignificant levels after the inclusion of maternal IQ and the Home Observation for Measurement of the Environment.")
That quote is referring to the baby's cognitive test scores, not the mother's.
See also: http://dienekes.blogspot.com/2010/07/breastfeeding-and-iq-st....
Also: http://www.ncbi.nlm.nih.gov/pubmed/10224215 ("Significant relations between breastfeeding and Woodcock Reading Achievement scores at 11 years were also reduced to nonsignificant levels after the inclusion of maternal IQ and the Home Observation for Measurement of the Environment.")