Why do hospitals keep the placenta?

Hospitals treat placentas as medical waste or biohazard material. Some hospitals keep the placenta for a period of time in case the need arises to send it to pathology for further analysis.

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And another question, what is the golden hour after birth?

The first hour after birth when a mother has uninterrupted skin-to-skin contact with her newborn is referred to as the "golden hour." This period of time is critical for a newborn baby who spent the past nine months in a controlled environment. One may also ask what are cords of attachment? In the context of relationships, the phrase "cords of attachment" is a symbolic representation of the emotional bonds between two people. The depth of the cords of attachment often represent how intimately connected two people are.

One may also ask what does it mean to cut a cord?

Meaning: To become independent of someone. Example: He needs to cut the cord and stop depending on his parents for financial support.