Researchers have identified novel biomarkers related to fetal and neonatal environmental exposure, which may help understand the effects of various substances on development. These biomarkers, found in sources such as baby teeth, placenta, and DNA, can indicate exposure to toxins like metals and tobacco, and may be linked to neurodevelopmental disorders and cognitive effects. The discovery of these biomarkers could lead to a better understanding of how environmental factors impact fetal and neonatal health and development.