My almost 8 year old has a pre-scoliotic spine. It is currently still within the 'normal' range, but could progress as she grows older.
When she was 5, I noticed one hip stuck out slightly more than the other, but it wasn't until she was 7 that I decided I couldn't live with the worry anymore, and did something about it. That's when we were told that yes, her spine isn't entirely straight, which I have to say was one of the worst days of my life as I didn't know what to expect. It is quite a shock for sure. But it will be ok!
My daughter's curve is (for now) considered postural, meaning that there is nothing structurally wrong with her spine, but the way she carries herself, compounded by a slight muscle imbalance and weaknesses of the shoulders and core, is pulling the spine out of alignment. Or something like this anyway, I'm no expert. She has no other conditions or problems, and no difficulties related to the condition of her spine thankfully. It's extremely mild; all but invisible. We were very lucky to pick it up. I thank my health anxiety for that. It's useful sometimes!!
The therapists she is seeing believe that many cases of scoliosis start this way but aren't picked up until they become more apparent and the person is older, with a spine that is more 'fixed'. And thus, the scoliosis has become structural.
We have been going to Scoliosis SOS with my daughter for treatment and support - do Google it, there are several clinics around the country. She is under an amazing team of scolio-therapists, not entirely unlike physiotherapists, and has a set of exercises she performs every day in order to improve her posture and reduce the rotation of her spine. She will have to continue with these until she is grown up, but with luck and perseverance, we have a very good chance that she will grow up with a normal spine. Which is amazing. And the change in her body has been incredible - the picture should speak for itself.
It hasn't been cheap, but if you can afford it, I would recommend Scoliosis SOS to the ends of the Earth. They help all kinds of people - those who have had scoliosis for years and are now elderly, teenagers, tiny children ... everyone. They have a very high success rate. They cannot, of course, entirely vanish a curve for everybody, especially those who are older/more severe, but in terms of decreasing rotation, improving mobility, helping with pain and - yes - deformity, they are worth their weight in gold.