Bacterial and fungal genera significantly associated with in utero and postnatal lead levels (pFDR<0.05). Estimates shown are coefficients from zero-inflated negative binomial models or standard negative binomial models, after adjusting for tooth type, attrition, batch, exact age at stool sample collection, and child race. These can be interpreted as the change in log genera abundance, for a 1-standard deviation increase in lead levels.