Can herbicide residues in baby food affect an infant's gut and brain development?

What's actually in it

Herbicides like glyphosate, atrazine, and 2,4-D are sprayed on crops to kill weeds. Residues from these chemicals remain on grains, fruits, and vegetables after harvest. When those crops are processed into baby cereals, purees, and snacks, the herbicide residues come along.

Babies' digestive systems are still forming. Their gut bacteria (the microbiome) play a critical role in immune function, nutrient absorption, and even brain development. Anything that disrupts this delicate ecosystem during the first year of life can have lasting effects.

What the research says

A 2026 study in Ecotoxicol Environ Saf examined the relationship between early-life herbicide exposure, gut microbiota composition, and neurobehavioral development in infants. The researchers found that herbicide exposure was linked to changes in gut bacterial populations and associated with altered neurobehavioral outcomes.

The gut-brain connection is well established in science. The bacteria in your gut communicate with the brain through the vagus nerve and by producing brain-signaling chemicals like serotonin and GABA. When herbicides kill or suppress certain beneficial bacteria, this communication breaks down.

What makes this especially concerning is timing. The first two years of life are when the microbiome is being established and the brain is growing faster than at any other point. Disruptions during this window may set the stage for developmental differences that show up later in childhood.

To reduce your baby's herbicide exposure, choose certified organic baby foods, cereals, and purees whenever possible. Organic farming doesn't use synthetic herbicides. If organic isn't available for everything, prioritize it for the foods your baby eats most often, like rice cereal, oat cereal, and fruit purees.