Can phthalate exposure in early pregnancy affect your baby's weight and your own weight gain?

What's actually in it

Pregnant women are exposed to heavy metals like lead, mercury, and cadmium through food, water, and household products from the very start of pregnancy. These metals affect how the body handles weight gain and nutrient delivery to the baby. Both too much and too little weight gain during pregnancy can affect the baby's growth.

What the research says

A 2026 study in J Korean Med Sci found that heavy metal exposure in early pregnancy affected fetal growth through a chain of events: metals changed maternal weight gain patterns, which then affected late-pregnancy blood metal levels, which in turn influenced how big the baby grew.

The study revealed that maternal weight gain acts as a mediator between early metal exposure and birth size. This means metals can harm your baby even without crossing the placenta in large amounts.

During pregnancy, filter your water, eat a varied diet, and avoid known metal sources. Getting enough iron and calcium helps your body absorb less of the toxic metals.