A study evaluated 601 mother-child pairs  from Canada.  The children were born between 2008 and 2012 and 41% lived in communities supplied with fluoridated municipal water. Data were analyzed between March 2017 and January 2019.

Maternal urinary fluoride (MUFSG) was provided from 512 pregnant women and self-reported maternal daily fluoride intake from water and beverage consumption was available from 400 pregnant women

A 1-mg/L increase in MUFSG was associated with a 4.49-point lower IQ score in boys, but there was no statistically significant association with IQ scores in girls. A 1-mg higher daily intake of fluoride among pregnant women was associated with a 3.66 lower IQ score in boys and girls.

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Association Between Maternal Fluoride Exposure During Pregnancy and IQ Scores in Offspring in Canada