Medically reviewed by Jonathan B. Jassey, DO Key Takeaways The Moro reflex is a startle response in babies that makes their arms extend and retract. Newborns grow out of the Moro reflex within the ...

As soon as your baby’s born, you’ll notice their primitive reflexes — although you might not know them by name. Case in point: Nothing in the world produces the same amount of wonder that you feel ...