Babies are capable of some remarkable and occasionally puzzling actions. That adorable grin? It’s likely just gas. And when your little one wraps their tiny fingers around yours, it might feel like an instant bond—though it’s probably just a reflex. So, if you catch your baby lying on their back, seemingly preparing for a duel, you might mistakenly think they’re destined for a fencing career. (College scholarships, right?) Unfortunately, this behavior is also a reflex, specifically known as the tonic neck reflex, which comes in two forms: asymmetrical and symmetrical. Here’s a closer look at each.
What is Asymmetrical Tonic Neck Reflex?
When most people mention the tonic neck reflex, they’re usually referring to the asymmetrical tonic neck reflex (ATNR), commonly called the “fencing position.” This reflex occurs when a baby turns their head to one side, causing the arm on that side to stretch out while the opposite arm bends at the elbow. Typically, ATNR lasts until the baby is around five to seven months old. So, if you notice ATNR in your little one around Halloween, you might be halfway to a charming Robin Hood costume!
Why Does the Tonic Neck Reflex Occur?
One theory suggests that this reflex aids in smoother passage through the birth canal during delivery. After birth, ATNR can help babies discover their hands and develop hand-eye coordination. To see if your baby can demonstrate the tonic neck reflex, lay them on their back and gently turn their head to one side. If ATNR is present, the arm on the side their face is turned towards will reach out while the other arm flexes near their head.
What is Symmetrical Tonic Neck Reflex?
Unlike ATNR, the symmetrical tonic neck reflex (STNR) typically emerges when a baby is between six and nine months old. This reflex assists babies in getting onto their hands and knees, which is why it’s often referred to as the “crawling reflex.” The STNR involves a baby bending and extending both their arms and legs in a specific way:
- When a baby brings their chin to their chest, their legs straighten while their arms bend.
- Conversely, when they move their chin away from their chest, their legs bend and their arms straighten.
This reflex is not only adorable to observe but also crucial for a baby’s development, as it teaches them to coordinate the movement of their upper and lower body. However, it typically fades away by nine to twelve months as they become more proficient at walking.
In some cases, a baby might continue to exhibit STNR after their first birthday, and that’s okay! Every child develops at their own pace. If you notice your baby doing things like walking on their hands and feet or preferring to lounge on the floor, it’s usually nothing to worry about. If you have concerns about your baby’s growth and development, consult your pediatrician for guidance.
Other Reflexes to Know About
Several other reflexes help explain your baby’s movements:
- Moro Reflex: This reflex causes the baby to cry, arch their back, and pull their limbs inward.
- Rooting Reflex: When the corner of their mouth is touched, babies instinctively “root” to find a nipple.
- Grasp Reflex: Triggered by a gentle stroke of the palm, this reflex prompts the baby to grasp.
- Suck Reflex: This prepares the baby for feeding, starting around the 32nd week of pregnancy.
- Stepping Reflex: Also known as the walking or “dancing” reflex, this makes a baby appear to take steps when held upright with their feet against a solid surface.
For more in-depth information about these reflexes, you might find it interesting to check out this article on home insemination.
Summary
Understanding your baby’s reflexes can help demystify their behavior, from the adorable fencing pose to other instinctive actions. If you’re curious about home insemination and its related topics, Cryobaby provides great resources, along with the Mayo Clinic for comprehensive information on pregnancy and insemination.
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