Is it safe? · Pregnancy Smart

Is Roundup exposure safe during pregnancy?

Assigned clinical reviewerPerry Friedman· MD, FACOG-MFMDraft · pending clinical reviewUpdated August 28, 2026

Use with caution

Reasonable for many people in modest amounts, though the pregnancy evidence is thin or dose-dependent. Worth a quick word with your provider.

The short answer · Is Roundup exposure safe during pregnancy?

Glyphosate, the active ingredient in Roundup, is a caution during pregnancy: MotherToBaby recommends not applying it yourself, since studies link higher exposure to shorter pregnancies and lower birth weight, though the overall evidence is still limited and mixed. If you must be near it, ventilate well, wear protective gear, and ask your healthcare provider about specific exposures.

This is a working draft: sourced from published clinical guidance and awaiting sign-off from its assigned clinician. It isn't personal medical advice, so consult your healthcare provider before changing anything in pregnancy.

What does the evidence say about roundup and glyphosate exposure during pregnancy?

MotherToBaby names glyphosate (Roundup) as one of the most commonly used pesticides in the US and recommends not mixing or applying it yourself during pregnancy; if that's unavoidable, it recommends a well-ventilated area and protective equipment like a respirator, long sleeves, long pants, and gloves. 1
Most animal studies on glyphosate haven't shown an increased chance of birth defects above the background rate, though human studies are mixed, with some suggesting a possible link to certain defects and others finding none. 1
In a study of pregnant women at a high-risk obstetrics clinic, glyphosate was detected in 99 percent of urine samples, and higher levels were linked to a lower birth-weight percentile. 2
In a Puerto Rico birth cohort, higher glyphosate and its breakdown product AMPA in maternal urine around 26 weeks were linked to shorter pregnancies, about 2 days shorter for glyphosate and 4 days shorter for AMPA per typical increase in exposure, with AMPA also linked to higher odds of preterm birth. 3
A systematic review of the human studies found the current evidence doesn't demonstrate that glyphosate causes pregnancy harm, but called the data too limited and indirect to count as proof of safety either. 4

Is roundup and glyphosate exposure safe in each trimester?

First trimester. Organs are forming fastest now, which is the best reason to hand off any yard spraying to someone else this trimester rather than mix or apply it yourself.
Second trimester. The studies linking glyphosate to shorter pregnancies measured exposure in the second and third trimesters, so this is a reasonable window to keep minimizing contact rather than assume the sensitive period has passed.
Third trimester. Since higher exposure has been tied to earlier delivery in some research, steady avoidance of personal application, not just a one-time precaution, is the more consistent approach heading into the home stretch.

Frequently asked questions

Is glyphosate exposure harmful during pregnancy?

The honest answer is that it's not settled. Some cohort studies link higher exposure to shorter pregnancies and lower birth weight, while a systematic review says the overall evidence isn't strong enough to prove harm, only too limited to prove safety either.

Is it safe to spray weed killer yourself while pregnant?

MotherToBaby's specific recommendation is to not mix or apply pesticides like glyphosate yourself during pregnancy. If someone else can't do it, use a well-ventilated area and protective gear: a respirator, long sleeves, long pants, and gloves.

How long should you stay off a sprayed area?

There's no single universal wait time; it depends on the specific product, so the label is the best source for a re-entry interval. As a general precaution, staying off the area until any spray has fully dried is reasonable.

Does living near sprayed fields raise exposure?

Some studies have used how close someone lives to agricultural spraying as a stand-in for actual exposure and found links to pregnancy outcomes, though a systematic review noted this kind of proximity measure hasn't been validated against people's actual exposure levels.

Do regulators consider glyphosate a reproductive risk?

That question has been actively contested and has shifted over time. Regardless of where the regulatory debate lands, MotherToBaby's practical advice stays the same: skip personal application during pregnancy and lean on ventilation and protective gear if you can't avoid being near it.

References

Pesticides: MotherToBaby Fact Sheet
MotherToBaby · https://mothertobaby.org/fact-sheets/pesticides-pregnancy/
Glyphosate exposure in early pregnancy and reduced fetal growth: a prospective observational study of high-risk pregnancies
PMC · https://pmc.ncbi.nlm.nih.gov/articles/PMC9552485/
Prenatal Exposure to Glyphosate and Its Environmental Degradate, Aminomethylphosphonic Acid (AMPA), and Preterm Birth: A Nested Case-Control Study in the PROTECT Cohort (Puerto Rico)
PMC · https://pmc.ncbi.nlm.nih.gov/articles/PMC8132611/
Glyphosate and adverse pregnancy outcomes, a systematic review of observational studies
PMC · https://pmc.ncbi.nlm.nih.gov/articles/PMC4895883/

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.