Previous Oddy article not about IQ; it's about adlescent mental health. this is the one you're looking for:
Oddy, W.H., Li, J., Whitehouse, A.J., Zubrick, S.R. and Malacova, E., 2010. Breastfeeding duration and academic achievement at 10 years. Pediatrics, pp.peds-2009.
Good luck. I must read it.
Eithne
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