How “Crossing the Midline” Helps Your Child with Reading
What is “crossing the midline”?
“Crossing the midline” means when a child’s arm, hand, leg, or even eyes move from one side of the body to the other side of that imaginary vertical line down the middle of the body. For example: using the right hand to reach something on the left side of the table. Or reading a line of text that goes from left-to-right across the page is a kind of visual midline crossing.
Why it matters: This movement shows that the two sides of the body (and by extension, the two sides of the brain) working together, communicating and coordinating.
How it links to reading
Reading isn’t only about recognizing letters and sounds, it also depends on how well the body and brain coordinate what the child’s eyes, hands, and cognitive systems are doing. Here’s how midline crossing plays into reading:
Visual tracking / left‐to‐right eye movement: When a child reads English (and many other languages), their eyes must move smoothly from left to right across each line of text. If their ability to cross midline (visually or with movement) is weak, they may lose their place, skip words or lines, or struggle with tracking.
Dominant hand / fine motor stability: If a child frequently swaps hands (instead of using a consistent dominant hand), or avoids reaching across their body, the dominant hand may not get refined practice. Fine motor skills feed into writing and sometimes even reading stamina (holding the book, following with a finger, pointing, etc.).
Bilateral brain integration: Reading involves what are sometimes called “left‐brain” functions (sequential processing, sounds, decoding) and “right‐brain” functions (visual spatial, attention, comprehension). Crossing the midline supports development of the neural pathways that allow both sides to cooperate.
Posture, trunk control and stability: When a child is reading, their posture, stability, and visual motor control matter. Midline crossing relates to trunk rotation, bodily coordination, and the ability to sit/track/read without excessive shifting or discomfort.
In short: when the motor and visual-tracking systems are smoother (thanks in part to good midline-crossing skills), children often have an easier time with reading tasks.
What research and professional associations say
A helpful piece from an occupational-therapy perspective notes that crossing midline is “a crucial motor skill milestone for young children” that supports body stability, posture, and (by implication) fine motor and visual motor skills.
A review of occupational-therapy practice found that sensory‐motor and motor‐planning skills (which include bilateral coordination and midline crossing) have positive outcomes related to attention, regulation, and motor function — and these motor skills build the foundation for academic tasks (including reading).
Clinical interviews with occupational therapists found that children who do not cross the midline spontaneously are likely to have delays in bilateral integration, and this can affect “motor and cognitive demands associated with specific activities” (which would include reading).
Several parent-friendly sources (from reading/learning centers) point out that difficulty crossing the midline can make reading more difficult because the eyes must “track from left to right” and the dominant hand might be less refined.
Important caveat: It’s worth noting that while many sources link midline crossing to reading and learning readiness, there is not a large volume of highly controlled research studies that treat midline crossing alone as the magic bullet for reading. Motor/visual/attention/reading skills are all intertwined. So, this is one piece of the puzzle.
Signs your child might be struggling with midline crossing (and thus reading readiness)
Here are things you might observe (especially in kids aged ~5-12 or so):
When writing or drawing, the child frequently switches hands mid‐task (instead of using one hand consistently) or keeps the paper very far to one side, so they don’t have to reach across.
The child often leans or turns their body awkwardly to reach something on the opposite side rather than reaching across naturally.
While reading, the child loses their place, skips back or forth, or says the words “move around” or “go back” or complains that reading is tiring. This might be due to less efficient visual tracking across the midline.
The child has poor posture, fidgets a lot, or shifts their seating position often when trying to read or write.
The child avoids activities that require reaching across their body (e.g., using the right hand to pick something up that’s on the left side, or vice versa) or shows lack of hand dominance (uses both hands for many tasks).
If you see several of these signs, it might be worth integrating more midline-crossing practice and considering consulting with an occupational therapist.
Simple activities you can incorporate (at home or at WHALE!)
Here are parent-friendly game ideas that build midline-crossing skills — many of these also support reading readiness/visual tracking.
Cross-Crawl Game
Have the child stand or sit and alternately bring their right elbow to their left knee, then left elbow to right knee.
Do 5-10 reps. This builds trunk rotation and cross-body coordination.
Bonus: Add a reading twist — before each cross (e.g., “right elbow to left knee”), the child reads a short word or sound. Then on the reach they say the word.
“Figure 8” Arm Tracing
Draw a large horizontal infinity symbol (a sideways “8”) on a whiteboard or paper. Have child stand (or sit) facing it, use one arm (then the other) to trace along the figure-8 shape. This requires crossing midline.
While tracing, the child can say a sight-word or letter each time they cross the center of the figure 8.
This builds visual motor, midline awareness, and supports eye-hand coordination.
Sticker Reach
Put stickers randomly on the child’s shirt/scarf/arms on left and right sides. Ask them to use opposite hand each time (left hand reaches to right arm, etc.) to peel off. This forces crossing midline.
To tie it to reading: After peeling each sticker, child reads a short word that you put under the sticker.
Side-to-Side Word Swat
On the wall or table, place word cards on both the right and left sides. Call out a word and have the child use the hand opposite the side the word is on (i.e., reach across). Then read the word aloud.
Reading Tracking Game
Mark a line of print on a page. Place a pointer/pencil on the left side. Ask the child to follow the line with their finger or a pointer, then reach over to the next line, etc. Emphasize smooth left-to-right, then down to the next line.
Combine with midline challenge: for each line, make them reach with opposite hand (if practical) or swap hands each time they start a new line.
Final thoughts
Crossing the midline may sound like a “motor skill” or “movement game” thing — and it is those things — but what’s exciting is that it also lays the foundation for reading, writing, attention, and learning. When a child’s body and brain work smoothly together, reading becomes less of a struggle and more of a joy.