Are you left or right handed? Maybe it depends on if you were breastfed - science news articles
Breast feeding linked to left-handedness

Researchers have proposed that the prevalence of being left handed is lower in infants who were breastfed than those infants who were bottle-fed. The study included 60,000 mother-child pairs and it took into consideration other factors associated with handedness.

Lets not confuse this correlation with causality since this study doesn’t propose that breastfeeding is the cause of left-handedness.

This study indicates that breastfeeding optimizes the processes involved which solidify the handedness of a person.

Read the full story: University of Washington
Scientific publication: Laterality: Asymmetries of Body, Brain and Cognition