“…Some of the reported risk factors, including environmental pollutants (25,58), dietary component of mothers during prenatal period (41,64), neonatal jaundice (47), maternal anemia (48), intrauterine growth retardation (6), lower weight gain during pregnancy (60), urbanization (62), parental occupation and education (35,47), gestational diabetes (6,46,59), and smoking (14,47,60) have limited evidence. It seems that more studies for investigating the association of the mentioned risk factors with CH are necessary.…”