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is a serious problem, it's cause should be found out because at times it can be progressive and dorsolumber scoliosis can cause respiratory insufficiency
and locomotor problems later on if it continues to progress.
Please get the base line and follow it yearly under the guidance of an orthopedician.
Causes can be constitutional-by birth, TB, Muscular maldevelopment-myopaties, skeletal problems of development.
I hope this advise would be helpful for you.
Wish you a great health!