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Moro reflex. The Moro reflex is often called a startle reflex because it usually occurs when a baby is startled by a loud sound or movement. In response to the sound, the baby throws back his or her head, extends out the arms and legs, cries, then pulls the arms and legs back in. A baby's own cry can startle him or her and trigger this reflex. This reflex lasts about 5 to 6 months. Tonic neck reflex. When a baby's head is turned to one side, the arm on that side stretches out and the opposite arm bends up at the elbow.
Here's the deal on newborn reflexes. Babies are pretty darn smart right from the start. In fact, from day one they instinctively know how to grasp a finger and root for the breast, along with several other reflexes that your babyâs pediatrician will check on his first day or two of life (and at subsequent well-baby checkups). These include: Moro reflex (also called startle reflex) 1  Trigger: While some babies sometimes startle for no apparent reason, usually itâs in response to a loud noise, a sudden movement or the sensation of falling (say, when you put your little one down in his bassinet without enough support).