What is crossing the midline?
Have you ever watched your child play in the sand with his bucket and spade? Did you notice that often the bucket is on the left side of her body, for example, while she digs in the sand on her right side and then transfers the sand from the spade to the bucket on the opposite side of her body?
Instead of adjusting her body to her actual environment, she uses her limbs to cross into her opposite body space. In other words, she’s crossing her midline – the imaginary line down the centre of the body – and using her right hand in her left body space and vice versa.
This may seem like a simple task to accomplish, but there’s much more to this skill.
Midline crossing is what ultimately ensures the coherent communication between the left and right brain hemispheres so that we can coordinate and sequence our own body movements and organise the space surrounding us.
How will not reaching this milestone influence my child?
A child who struggles to cross her midline will make random movements, and it will take a lot more time to do things, and will become very frustrating for her to finish a simple task such as brushing her teeth or drying herself off.
Not being able to cross the midline can also have an impact on a child’s emotional development, as well as her reading, writing and spelling skills.
The importance of tummy time, rolling and crawling for midline crossing:
Cause for concern
The following signs may indicate a problem with midline crossing. If you notice any of the following in your child, you may want to take her to an occupational therapist for an assessment:
- If she hasn’t established a dominant hand by four years old
- If she has poor hand dominance
- If she’s only using her one hand to do everything, and neglecting the other one
- If she uses her hands independently.
The importance of bilateral integration for midline crossing
“The importance of establishing bilateral integration is so that the child is able to establish dominance for her feet, arms, ears and eyes,” says occupational therapist Elsie Labuschagne. “First children learn to use two hands together for a symmetrical activity. Think of a toddler banging pot lids together. Then she learns to hold one hand still while the other works, and finally to use both hands simultaneously for different movements.”
This is what’s necessary to turn a paper with one hand while cutting out a circle with the other.
Activities to encourage midline crossing
Include these activities in your child’s everyday play. Remember that children develop at different rates and that the skill one child masters early may take another child a little longer to achieve.
You know your child best and will know when to introduce her to the below activities, as you’ll know what she’s capable of and what she’s not yet able to do.
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