![]() ![]() "Labor puts a good kind of stress on a baby," Timberline said. It's considered the stress hormone, and during times of stress, cortisol helps direct energy toward vital functions and away from less important tasks. In adults, cortisol plays a role in a vast array of physiological functions, from regulating metabolism to triggering your "fight-or-flight" response. ![]() It also helps the baby's body produce its own energy and heat. One hormone, called cortisol, helps babies' lungs mature, enabling them to take their first breath, Timberline said. Some hormones help the baby's arteries and veins develop, ensuring that the organs receive ample blood during labor and after the umbilical cord is cut, Timberline told Live Science. The onset of labor alerts a baby's body to start producing hormones that are crucial for life outside the womb. ![]() Both mother and baby undergo huge hormonal shifts during labor, which is necessary for a successful birth. ![]()
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