A number of research projects have been carried out by Finnish specialists whose aim was to study the dependence of the underweight of a child at birth with the formation of left-handedness.
Within the framework of the research project, about 1,500 Japanese triplets and thousands of Dutch people were subject to careful study.
Information was taken into account of the child's dominant hand, the length of the child's birth and how much his weight was when he learned to sit down, crawl, roll over, and also without anyone's help stand or move. In addition, the age of mothers in the period of.
It was revealed that the weight of left-handers at the time of birth was less than that of right-handers. In addition, left-handers developed motor functions at a slower rate during the formation of the organism. It was also observed that left-handers have a smaller head circumference than right-handed ones.
med-heal. en.