Lead Poisoning Study: 300 mothers and their newborns
In 2015, Pure Earth worked with the National Institute of Public Health (INSP) in Mexico on the first-ever effort to detect and measure exposure to lead poisoning at a state level in the country. The study was carried out in the state of Morelos to measure the blood lead levels of 300 mothers and their newborns. This was how we discovered Baby X.
In a late-night email labelled “URGENT,” a nurse wrote to inform us that they had discovered a newborn baby with a blood lead level of 40 micrograms per deciliter (µg/dL)! The CDC recommends health intervention at levels above 5 µg/dL–the newborn was eight times over that limit.
We immediately adopted the case of Baby X as a priority
Lead poisoning occurs when toxic lead builds up in the body. In the case of newborn babies, toxic lead from the mother is passed to the baby through the placenta.
Exposure to lead is an extremely serious health issue. In adults it causes damage to the nervous and reproductive systems, as well as the kidneys. In children, it can cause permanent brain damage and other developmental issues. We had no time to lose. In order for Baby X to have a chance at developing normally to his full potential, we needed to lower his blood lead levels as soon as possible.
So how did Baby X and his mom get exposed to so much lead?
There are a number of main sources of lead poisoning around the world. The informal recycling of used lead-acid (car) batteries is one of them, but in Mexico, the leading source of exposure is the use of traditional pottery made with lead-based glazes.
These beautiful pieces of pottery are used to cook and serve food in many homes and restaurants across Mexico. Lead in the pottery glaze mixes with acidic foods–like coffee, chili peppers, tomatoes and lemons–and quickly enters the bodies of anyone consuming the food. Up to 20% of Mexicans have elevated blood level levels. Baby X, his mother and grandmother were among them.
A quick and easy solution
We tested the pottery used by Baby X’s family and confirmed that they contained lead. The family cooked meals in their leaded pottery more than five times a week. To counteract the problem and start lowering Baby X’s blood lead level, Pure Earth changed the family’s pots–the new pots were made the same traditional way by artisans but using a lead-free glaze. They looked and functioned just like the family’s old pots.
In the months that followed, Baby X’s blood lead levels began dropping, sometimes by 5 points a month, sometimes more. After a year, Baby X and his mother showed a 90% decrease in their blood lead levels.
Baby X’s motor skills have improved and we are happy to report that he has hit all his developmental milestones. He is now a happy, healthy kindergartener.
With just a small change in the family’s pots, we were able to made a big difference in Baby X’s development and growth.
Pure Earth is working to make sure all the Baby Xs in Mexico get a chance at a healthy future. Since 2008, Pure Earth has been working with local authorities in Mexico to address the issue of lead in pottery. Our Barro Aprobado project is working to raise awareness about the dangers of leaded pottery, and to promote the use and production of lead-free pottery. Our efforts include helping artisanal potters switch to using lead free glazes, and working with restaurants and consumers to demand and use lead-free pottery.