The child's spirit relationship with the birth mother.

A true story that happened in Singapore.
The child's mother died during childbirth. After her death, the mother's heart was implanted in the body of the man in the black shirt.

The born baby is crying profusely. He does not calm down in anyone's arms. This time, when the man in the black shirt picked up the crying child, the child stopped crying and the child laughed. Because the heart of the child's birth mother has been implanted in that man's body. And the child was in that mother's womb for nine long months. That's why every beat of that heart, smell etc. was so familiar to the child that the child laughed with absolute certainty.