A new MU study links changes in gut bacteria to prenatal opioid exposure. Opioids impact the gut microbiome, which is a collection of bacteria that naturally live inside the gut of a fetus.
https://www.komu.com/news/midmissourinews/mu-study-indicates-prenatal-opioid-exposure-could-result-in-long-term-neurological-effects/article_0db241e0-11c8-11ed-aef8-4b2007a36bc2.html