Shock of birth
Encyclopedia
Shock of birth is the transient depression of muscle tone
Muscle tone
In physiology, medicine, and anatomy, muscle tone is the continuous and passive partial contraction of the muscles, or the muscle’s resistance to passive stretch during resting state. It helps maintain posture, and it declines during REM sleep.-Purpose:Unconscious nerve impulses maintain the...

 and deep tendon reflexes that occurs in newborns after birth
Birth
Birth is the act or process of bearing or bringing forth offspring. The offspring is brought forth from the mother. The time of human birth is defined as the time at which the fetus comes out of the mother's womb into the world...

. In 70% of newborns, it lasts less than 24 hours, and in 84.3% less than 48 hours. Its presence is not affected by whether birth happened through vaginal delivery or cesarean delivery. The term was introduced in 1960.
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