5-The "Baby Story" of Discovering One's Own Hands
ATNR → Hand Regard → Hand-sucking: How the Brain and Body Learn to Coordinate
1 | First, the [ATNR] Flips the Switch
What is ATNR? When does it start?
What is ATNR?
Asymmetric Tonic Neck Reflex (ATNR). *This is one of the primitive reflexes.
When the face is turned to the right, the right arm and leg extend, and the left elbow and knee bend.
As a general guide, this occurs from newborn to 3 months of age.
While the baby has mostly been making flexion and extension movements, they begin to start extension movements around this time.
Key Point
Linking "head orientation" with "limb movement" to input the concept of left and right into the brain.
Turning the neck → Stimulating the shoulder and arm joints → Preparation for hand regard.
2 | [Hand Regard]――"Whose hand is that?"
Staring intently at the hands
6–8 weeks old
Recognizing one's own hands as "external objects" (creating a body map).
Play Tips
Label the "moment they stare" with words.
・ "You see it! That's your hand, baby."
・Memory is solidified through simultaneous visual and auditory input.
3 | [Hands to Mouth]――Time for Sensory Integration
Hand regard → Bringing hands to the mouth → Hand-sucking
General guide is around 2–3 months.
While looking at their own hands through hand regard, they bring them to their mouth.
By sucking on them, they learn to recognize that what they see is part of themselves.
Integration of tactile, gustatory, and kinesthetic senses / Self-comforting to calm down.
How to encourage
・Use bare hands rather than mittens.Keep them clean & trim nails and let them suck freely.
・Create a posture where the hands can easily touch the mouth by holding them on their side.
4 | The [Hand Regard ⇆ Hand-sucking] Loop
Staring intently at the hands
Interest increases → Bring to mouth
The brain records the "sensation of sucking"
Then letting go and staring at them again...
This repetition cultivates a high-speed feedback circuit between the “hand and brain”, finger differentiation (dexterity)
(speech preparation) simultaneously.
5 | Q&A Common Questions
Q. They only lick one hand... Is the asymmetry a problem?
A.It is often caused by a habit of keeping the head turned to one side. Lay them down with the weaker side facing the light to provide balanced stimulation.
Q. Is it safe to keep mittens on them?A.
Stimulation is reduced, and opportunities for development decrease. Keep them only for outings or while sleeping; bare hands are better during the day.
Q. They don't stare at their hands even at 3 months oldA.
If they don't make eye contact or have weak tracking, consult a doctor or pediatrician early on.
6 | Hand Regard ➜ Hand Licking ➜ Bringing Hands Together... And Beyond
Hand regard (staring at hands)
Hand licking (integration of touch + taste)
Bringing hands together and squeezing
Grabbing a ring toy!
This sequence leads to later grasping, releasing, and pinching with fingers as well as fine motor skills, and further to
speech and self-regulation.
7 | Summary
ATNR → Hand regard → Hand licking is the first adventure of discovering “their own hands” and connecting the brain and body
Development can be sufficiently encouraged by faces, voices, and environmental contrast rather than tools
Be mindful of left-right balance and “time to lick freely” to support your baby's curiosity!
💬 Please leave questions in the comments!
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