Lead has the greatest impact on the neurological development of children, and even more so on the embryo or fetus that is still in the mother’s womb. If a woman of childbearing age works with lead and there is lead in her work environment, when and in what state should she choose to get pregnant again? It is generally recommended to control the blood lead to 200 micrograms/liter before pregnancy. It is best if it can be controlled below 100 micrograms/liter. If you find out you are pregnant and then measure your blood lead, how high is it that you are not suitable to have a child? If the venous blood lead is below 300 mcg/L, it is not easy to have a child and it is usually advisable to keep it. After all, it is God’s gift to you, although it is possible that higher blood lead levels may have a greater impact on the child’s neurodevelopment. However, doctors usually advise parents to keep the child. If the mother is the one who discovered high blood lead while breastfeeding, how high a blood lead level makes breastfeeding the child unsuitable? It is generally believed that breast milk is the best food for babies, but if the mother’s blood lead is above 300 micrograms/liter, then breast milk is “less pure” because lead can be secreted into breast milk through the mammary glands, and the child will still have health effects after eating the mother’s milk containing lead, which will do more harm than good compared to the advantages of breast milk! We do not recommend mothers with blood lead levels above 300 μg/L to breastfeed their children.