UW News

Phillipe Hujoel


January 7, 2019

UW study: Long-term breastfeeding sheds light on whether an infant becomes right- or left-handed

Bottle feeding infants is associated with left-handedness, according to a new study from the University of Washington. The study found that the prevalence of left-handedness is lower among breastfed infants as compared to bottle-fed infants. This finding was identified in about 60,000 mother-infant pairs and accounted for known risk factors for handedness.