There are various scientific theories explaining why most people swing babies by the left arm crease. One suggests that this position allows the child to better hear the adult’s heartbeat.
It may also be related to a person’s hearing. It is known that people perceive sound information faster with the left ear than with the right ear. It turns out that we use our left ear and left eye to obtain information about the baby’s emotional state. It is known that signals from the left side of the body are transmitted to the right hemisphere of the brain, which specializes in interpreting emotions and faces.
Another theory concerns the use of the dominant hand. Most of us are right-handed, so it is more convenient for us to free this hand and place the child on the left side. The most natural thing for left-handers is to place the baby in the crook of the right arm.
However, as children grow and become heavier, most people then use their dominant hand to carry them. This is because this hand is stronger than the non-dominant hand.
Source: Ferra
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