Parenting
What is the Palmar Grasp Reflex in Infants?
By Team Happy Parenting
Updated: July 16, 2021
Originally Published: November 17, 2020
Photo by Alex Smith/Unsplash
Babies are known for their adorable antics, which help balance out the endless crying and diaper changes. One of their most charming behaviors is the way they grasp your finger with their tiny hands. While it might seem like a conscious act of affection, it’s actually an involuntary response known as the palmar grasp reflex, a completely normal reflex observed in newborns. This reflex is part of a collection of primitive reflexes that also includes rooting, sucking, the Moro reflex, tonic neck reflex, and the stepping reflex. Here’s what you need to know about the palmar grasp reflex.
What is the Palmar Grasp Reflex?
The palmar grasp reflex—sometimes referred to as the “Darwinian Reflex” in honor of Charles Darwin—occurs when the palm of a baby’s hand is stroked, prompting them to close their fingers. This reflex generally persists until the baby is about five or six months old. (The similar reflex involving the toes, called the plantar reflex, typically remains until around nine to twelve months.) Around four months, infants will begin to exhibit an ulnar palmar grasp, allowing them to hold onto an object placed in their palm while wrapping one or two fingers (but not the thumb) around it.
Don’t underestimate the strength of your baby’s grip; it can be surprisingly strong! When you try to pull your finger away, their hold will likely tighten. This is a positive sign, indicating that their nervous system is developing properly.
How Long Does the Palmar Grasp Reflex Last?
As babies grow, so does their palmar grasp ability. By eight to nine months, they transition to the radial palmar grasp, which involves more refined finger movements. At this stage, babies will start picking up objects using their fingertips rather than their whole hand. Eventually, between twelve to fifteen months, they will utilize the palmar supinate grasp, holding a crayon or similar object in a fist with their thumb on top, allowing them to begin “drawing” or scribbling.
How Can You Test a Baby’s Palmar Grasp Reflex?
If you’re curious to see your baby’s palmar grasp reflex in action, it’s quite simple. Lay your baby on a comfortable and safe surface, such as a soft mat or crib mattress. Present both of your pinkies to them and wait for them to grasp. Gently lift their arms a few inches while they hold on. Keep in mind that they may let go when they become tired, causing their arms to drop suddenly. This is completely normal, and there’s no cause for concern.
Why is the Palmar Grasp Important?
While the original purpose of the palmar grasp reflex is not entirely understood, experts believe it helps establish basic motor patterns necessary for voluntary grasping. It’s also a useful tool for doctors, as an exaggerated or weak response could indicate neurological issues if it persists beyond six months. Should you have any worries about your baby’s motor or cognitive development, consult your pediatrician.
What Comes After the Palmar Reflex?
Curious about the next milestones for your little one’s hands? By six to seven months, they will develop the radial palmar grasp, where they begin using their thumb to pick up objects. This involves their index and middle fingers curling around an item while their thumb opposes and presses it into the radial side of their palm—hence the name radial palmar grasp.
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Summary:
The palmar grasp reflex is an involuntary response in newborns that allows them to grasp objects placed in their hands. This reflex typically lasts until they are about six months old and is part of a series of primitive reflexes essential for a baby’s motor development. Testing this reflex is simple and can provide insight into your baby’s neurological growth. As they mature, their grasping abilities will evolve, leading to more advanced motor skills. Consult with a pediatrician if you have concerns about your baby’s development.
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