The Moro reflex refers to a baby responding to the sudden loss of support by spreading out their arms and legs, followed by pulling them into the fatal position (the way the baby is crammed up inside the womb) while crying. It is a primitive reflex that is usually present in infants from birth.
What Triggers It?
Loud noises, intense light, the sensation of falling, or moving suddenly by themselves can trigger the Moro reflex.
Testing the Moro Reflex
Doctors simulate the sensation of falling by gently lowering the baby’s head relative to their body to test the Moro reflex. The baby responds by extending their arms out with open palms and their legs pointing upwards.
The presence of the Moro reflex is a sign of symmetry and intactness of the nervous system. If it is absent from one side of your baby’s body that can point to a broken shoulder or a nerve injury; however, if it is absent from both sides than that might suggest there is brain or spinal cord damage.
This reflex disappears between 3 to 6 months of age once a baby can support their head.
If you suspect that the baby has an easily triggered or absent Moro reflex, contact your baby’s pediatrician immediately.
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