What Is The Moro Reflex?

The Moro reflex—often called the “startle reflex”—is a primitive reflex present at birth. It’s an automatic, involuntary response to sudden changes in sensory input, such as loud noises, bright lights, or unexpected movement. When triggered, a baby will:

• Quickly extend their arms and legs outward

• Open their hands

• Then bring their arms back toward the body (often appearing like a “hug” motion)

• Frequently cry afterward