Breastfeeding and happy babies: EEG asymmetry in at-risk infants. – Child Psychology Research Blog
So although maternal breastfeeding behaviors are clearly affected by the babies temperament, it seems that breastfeeding also affects the babies temperament and EEG patterns.
The authors provide a nice conclusion:
Specifically, infants of depressed mothers who breastfed did not demonstrate the greater relative right frontal EEG asymmetry (nor the left frontal hypoactivity) compared to the bottle fed group. Moreover, increased positive affect was apparent in 3-month-old infants of breastfed compared to the bottle-feeding/depressed group suggesting that breastfeeding should be examined further as a potential intervention factor for depressed mother and their infants.
Jones, N. (2004). Patterns of brain electrical activity in infants of depressed mothers who breastfeed and bottle feed: the mediating role of infant temperament Biological Psychology, 67 (1-2), 103-124 DOI: 10.1016/j.biopsycho.2004.03.010