Immobility reaction at birth in newborn infant.

Objective: To describe an immobility reaction (IR) that was not previously reported at or immediately after birth in human newborns.

Method: We analyzed 31 videos of normal term vaginal deliveries recorded from Time 0 of birth defined as the as the moment that lies between the birth of the thorax and the pelvis of the infant. We searched for perinatal factors associated with newborn's IR.