The medical community has long known that if the amount of lead in a newborn exceeds ten milligrams, this will affect intellectual development. An excess of lead in the mother's body can also lead to miscarriage, dead births, or infant mortality.
醫學界早有證據顯示，新生兒血中鉛含量若超過十五微克，將影響智力發展；母體含鋁量過高也可能導致流產、死產或新生兒死亡。