One of the most common forms of stress for a fetus is being oxygen-deprived. Now, University of Florida researchers have studied an animal model and found that reducing oxygen for even a short period of time can drive bacteria from the mother’s body into the fetal brain.
Full article here: http://biomed.med.ufl.edu/2017/08/28/low-oxygen-leads-to-fetal-brain-bacteria-in-animal-model-uf-health-researchers-find/