I don't remember the exact conversation that took place between Pam Formosa (owner/director of Brain Fit Academy) and my husband and I. However, I'm sure that it happened during our initial screening appointment with her and I know it went something like this:
Pam: "Did he ever crawl? As a baby, did he crawl?"
Me: "No- he didn't. He started walking at nine months."
Pam: "Hmm...let me explain something...."
At this point, she would have explained the STNR reflex to us.
STNR stands for Symmetrical Tonic Neck Reflex. Also, sometimes referred to as the crawling reflex. This is the reflex that when the baby raises its head against gravity, the baby's arms extend, lifting the chest off the floor. The knees and hips bend and the baby sits on their heels. If the baby looks down while on all 4's, their arms bend and their legs straighten.
The primary purpose of the STNR is to get the baby into the crawling position, and it is expected to emerge (show up) at around 6-9 months after birth, and integrate (finish) by around 9-11 months. But you see, the STNR plays a bigger role in the grand scheme of things because this reflex (once integrated) gives way to the emergence and development of life-long postural reflexes.
Now as a young mother, I can remember thinking (and perhaps even bragging!) about how my children must have been so ahead of development that they didn't have to crawl.
Neither of my children crawled. They both went from pulling themselves up on the furniture, to cruising the furniture, to walking. Literally no crawling. Not even a funky, different type of crawl, or a creep. Nope- right to walking. Both right around 9-10 months of age. And, my children are 18 months apart, so let me tell you- that made for some busy times!!
You may be wondering at this point- why is it so important that babies crawl? Well, remember how I've explained in other posts that primitive reflexes are early motor patterns that babies go through? And how that early movement sets up the brain for later development? The STNR reflex (and the integration of it) also plays an important role for later development.
If the STNR reflex is unintegrated (hasn't finished it's job) some of the things you might see are:
- The inability to crawl on hands and knees
- No isolation in upper/lower body
- The tendency to slump when sitting- particularly at a desk or table
- Difficulty doing activities where one side of the body must do a movement that is opposite of the other. For example, holding a paper steady or tying shoes.