It is the fastest way to definitively know that they are breathing and their airway is not obstructed. Babies go for a period without oxygen when the enter the birth canal because they get their oxygen from the umbilical cord which is heavily compressed and the placenta has detached from mom during labor. This is why they usually look blue when they come out. They can also inhale liquids and even their own poo and potentially choke. If you can hear them crying, the airway is more or less patent and they didn’t die during delivery.
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