Facebook post by University of Helsinki

About every one person in ten in the world is left-handed. The mechanisms of handedness development, however, remain poorly known. Researchers studied over 2000 Japanese and Dutch triplets to see how prenatal development, and especially very low birthweight, is linked to the formation of handedness. The effect of birthweight was very similar in both countries.
Low birthweight linked to left-handedness helsinki.fi

“The observation of the link between left-handedness and low birthweight in two very different cultures is an especially convincing result and enhances our former understanding of the importance of prenatal development in handedness formation, says Eero Vuoksimaa, docent of neuropsychology at the University of Helsinki, who led the study.