In a recent study published in the American Chemical Society’s Environmental Science and Technology Letters, scientists found 10 times more microplastic in babies’ feces than in adults’. Researchers discovered this in a pilot study that involved sifting through infants’ used diapers. The researchers established that each gram of infant poop contains an average of 36,000 nanograms of polyethylene terephthalate (PET). PET is one of the most common polymers.