The researchers controlled for several factors in their analysis, including race and ethnicity, marital status, the mother's education and IQ, as well as whether the children were born prematurely or exposed to environmental toxic chemicals like air pollution. Stress experienced by mothers during pregnancy is also related to Because childhood IQ is a predictor of education level, socio-economic status and professional success later in life, researchers say there is potential for impacts to last into adulthood. Earlier research found lower performance IQ in boys but not girls whose mothers were exposed to lead, and a study suggested boys whose moms had fluoride in pregnancy scored lower on an IQ assessment. What the pregnant mothers ate or whether they breastfed were not included in the analysis. The team also examined and accounted for the nurturing environment in a child's home, looking at how parents interacted with their children and if the child was provided with books and toys.
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