Is it safe to use glyphosate-based weed killers in a garden while pregnant?

What's actually in it

Roundup and similar products are built around glyphosate plus surfactants that help the chemical stick to leaves. Spraying in a backyard releases an aerosol that drifts several feet. Skin contact through shoes and legs is normal. Hand-to-face transfer moves the chemical to the eyes and mouth.

Pregnancy doesn't give you a pass on exposure. Glyphosate and its main breakdown product, AMPA, cross the placenta.

What the research says

A 2026 study in Int J Hyg Environ Health measured urinary glyphosate and AMPA in pregnant women and linked the levels to birth outcomes. Higher maternal glyphosate was associated with lower birth weight and shorter gestation. The association was strongest for women with direct application exposure, not just dietary intake.

For a backyard, manual weeding is slower but clean. A boiling water pour kills weeds in cracks and walkways without any chemistry. Vinegar-based weed killers (20% horticultural vinegar, sold at hardware stores) do most of what glyphosate does, with skin contact still wanting gloves but no placental crossing. If a larger area really needs treatment, hire someone else to spray and keep the pregnant person out of the yard for a few days afterward.