Why do Newborn Babies Startle? The Moro Reflex

Why do Newborn Babies Startle? The Moro Reflex | Baby Chick

Why do Newborn Babies Startle? The Moro Reflex

Have you ever noticed how babies are constantly moving? Even newborn babies are wiggling, reaching, turning their head from side to side, kicking their legs, and even jumping like someone just popped out and scared them. These early movements are not purposeful. These early movements are simply reactions to reflexes.

Newborn Reflexes

Reflexes, sometimes called “primitive reflexes” or “newborn reflexes” are actions that originate in the baby’s central nervous system, which is their brain and spinal cord. When the baby feels a particular sensation or stimuli, a motor reaction occurs. As babies grow and develop and the frontal lobe of the baby’s brain matures, these reflexes go away or integrate and purposeful actions take over.

A perfect example of this is the palmar grasp reflex. When a baby feels pressure in the palm of her hand from your finger, her palmar grasp reflex kicks in and she automatically closes her hand around your finger. This is an adorable reflex as it appears that she is holding your finger, but really the reflex just kicked in and she can’t not hold your finger. As this reflex begins to integrate, she is able to purposefully release items, such as a rattle. This allows her to put a toy down and reach for another one, put food into her mouth, hand you a toy, or pass a toy from one hand to the other. If the reflex does not integrate, it will begin to interfere with her function as she will never be able to purposefully let go of something.

The presence of primitive reflexes and then the integration of primitive reflexes signifies an intact neurological system. As a side note, it is also important to note that your baby’s reflexes are symmetrical on both sides of their body. In other words, both hands should have the same palmar reflex.

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The Moro Reflex

Another very common, well-known reflex is the moro reflex, also called the startle reflex. I’m sure all parents are familiar with this reflex. This one is not as cute as the palmar grasp, as it can sometimes alarm parents. It can be unnerving to see your baby jump and appear to be scared and the reflex often makes parents feel bad if they are the cause of the reflex. Parents can rest assured, the moro reflex is an important part of normal development and the presence of this reflex before three to four months of age is indicative of a healthy neurological system.

The moro reflex looks like the baby quickly extends their arms away from their body, then pulls them back in toward their body, curling their hands inward. The baby may also extend their legs.

Why Babies Startle

The moro reflex can be stimulated by several things. Motorically, it can be stimulated by dropping the baby’s head back slightly, or any sudden movement to the baby, such as holding the baby under her back and then quickly dropping your hands a few inches, so she is quickly lowered. When the baby feels like he is falling, the reflex kicks in. The moro reflex is also stimulated by a loud sound or a bright flash of light. You may notice your baby startle when you turn on the light.

There are other, less overt triggers that can cause your baby to startle. An internal stimuli, such as a little belly gurgle or the movement of gas can cause the moro reflex to kick in. Your baby may even startle in response to her own cry. Sometimes we don’t know what causes it. You may not see a movement, hear a noise, or see a bright light and it can be alarming to see your baby startle for seemingly no reason at all, but it might be something only your baby can feel. It is also important to know that some babies are just more sensitive and will startle quicker and more often than others.

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Researchers believe the moro reflex originally existed to help babies grasp their mothers if they begin to fall.

Try not to feel bad if you inadvertently sneak up on your little one and make him jump. It is a perfectly normal and common reaction. Sometimes when babies have a hyper reaction to the moro reflex, it can interfere with their sleep if they are constantly startling themselves awake. You can help by swaddling your baby tightly in a blanket so their limbs are contained. This lessens the moro reflex. You can also hold your baby close to you so you physically inhibit the startle reflex a little bit.

About the Author /

Dr. Aimee Ketchum is a pediatric occupational therapist and has been working in pediatrics for 20 years. Ketchum works in the neonatal intensive care unit (NICU) at UPMC Pinnacle Hospital and lives in Lancaster, Pennsylvania with her husband and two daughters. Ketchum is also the owner/operator of Aimee’s Babies LLC, a child development company.

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No, the blood won't drain out of baby and go backwards into the placenta.⁠
No, your baby is not more likely to get sick from jaundice.⁠
Yes, your baby will still be getting oxygen while they figure out breathing, especially important if they need resuscitation.⁠
Yes, your baby will have better iron levels for the first year of their life.⁠
Look at how thick and engorged this cord still is at 4 and 18 minutes after baby was born. Just imagine how much blood baby would have lost if the cord had been clamped immediately, or at 60 seconds, 90 seconds, or 3 minutes! The placenta was expelled immediately before the 18 minute photo was taken. The pulse in the cord could still be felt even AFTER THE PLACENTA HAD BEEN DELIVERED! The cord was finally clamped and cut more than an hour after birth at 73 minutes. ❤️⁠
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1️⃣ Get outside when possible.⁠
2️⃣ Video chat with friends/family.⁠
3️⃣ Join a virtual group.⁠
4️⃣ Invite someone to come over.⁠
5️⃣ Find a local mom's group.⁠
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