Abstract
Bu nuqsonlar ilmiy tilda yuqori lab va tanglay kemtikligi xeylolizis deyiladi. Kelib chiqish sabablari juda koʻp .Shuningdek, yaqin qarindoshlar o`rtasidagi nikoh, ayol yoki erkakning kimyo sanoatida faoliyat yuritib, texnika xavfsizligi qoidalariga rioya etmasligi, farzand ko`rishni noto`g`ri rejalashtirish singari omillarning ham jiddiy ta`siri bor. Lo`nda aytganda, bolaning tug`ma nuqson bilan dunyoga kelmasligi otaning ham, onaning ham sog`lom hayot kechirishiga birdek bog`liq.
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