Why mothers carrying their babies on the left shoulder?

It is natural that mothers carrying their children, but to get them to specifically left shoulder was a mystery baffles scientists many years ago that revealed a recent study to hide this simple act.
The new study has shown that mothers carrying their babies on the left shoulder, help to keep the babies in a safe position by allowing the right side of the brain processes information about their situation and interact with their behavior quickly.
This phenomenon is known to control brain, and previous research has shown a preference between 70% and 85% of mothers carrying their babies on the left shoulder.
The scientists from the Saint Petersburg State University in Russia to examine the extent of the preference of mothers to put their babies on the left shoulder, not only in humans but also included the study of animals in order to understand the feasibility of this preference in the interaction between mother and child.
The report, which was published in "Nature Ecology and Evolution" that the child on the left shoulder tote is a distinctive feature of the behavior of mothers in humans and ape, but the evolutionary origin is still unknown.
The researchers said that the child on the left shoulder mode is the best way the mother to make notes quickly the reactions of her child and behaviors such as crying and laughing and even yawning, which helps to quickly respond to emergency situations where it is sent to the right side of the brains of mother and be processed by emotion. The researchers stressed that this method facilitates sensory bonding between the mother and her child.
The researchers studied ten types of animals and found that some of them would prefer to maintain their young on the left side, such as dolphins and kangaroos, which supports the findings of the researchers as the left side makes it easy on the brain information processing.
It uses the left side of the brain generally in tasks related to language and thinking analysis and described superiority in the implementation of the calculations and reasoning, while the right side of the brain is responsible for face recognition and expression of feeling which is also responsible for the sense of place and intuition and agility, listening to music and helps us to understand what we see and understand the emotions, so the adoption of a child carried on the left side helps to easily identify the needs of the child, and the interpretation and deal with it quickly.