Previous research has associated the chemicals, found in many consumer products, with pregnancy complications and abnormal child development.
Researchers seek to isolate cannabis from concurrent use of alcohol, tobacco, and illicit drugs.
Even those born without signs of Zika infection need long-term monitoring, they warn.
"In 1990, as a Ph.D. student at the University of Washington, I and a colleague studied 68 infants whose moms smoked pot while nursing. Those infants, we found, had significant delays in motor development."
Picky eating among toddlers is almost universal, says UW Medicine pediatrician Molly Grow. Children play with food as a means to get more comfortable with it, she says.
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