Recently, a study conducted by Yale University's infant cognition Center showed that 6~10 months old babies had social judgement before they could speak, and they could distinguish good and bad playmates.

In the experiment, a wooden doll with big eyes climbed up the mountain, and another big wooden doll came up.

One is that the latter helps the former force to climb up, and the other is the latter to help and pull back.

After that, the researchers took the two dolls to the babies to see which toys they chose.

As a result, almost all babies choose the doll that is willing to help.

If the doll that is in trouble is put together with the doll that is neither helpful nor bad, the babies choose the neutral toy doll, which is neither a helping hand nor a bad toy; but when the neutral doll and the willing doll are put together, they choose the doll that will help.

Research shows that this social ability of human beings may be born without learning.