Women who smoke during pregnancy appear to coal and pesticides has achieved four times more likely to give birth in a nervous tube defects (NTD), it is based on a study done in China. The researchers studied on 80 newborns and aborted fetuses with defects of the brain and spinal cord defects in the placenta and they clearly have a much higher amount of certain chemicals than babies without birth defects placenta.
Birth defects has long been associated with folic acid deficiency, maternal obesity and diabetes. Environment pollution has also been suspected as a cause of others, but as yet there is very little direct evidence to show that relationship.
In research in China, researchers detected a polisiklik aromatic hydrocarbons (PAH), high levels of inhaling