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Dr. Leeka Kheifets and her team at the UCLA School of Public Health looked at a group of 13,159 children whose mothers had been recruited to participate in the Danish National Birth Cohort study early in their pregnancies. When the children reached age 7, mothers were asked to complete a questionnaire about their children's behavior and health.

After the researchers adjusted for factors such as a mother's psychiatric problems and socioeconomic factors, children with both prenatal and postnatal cell phone exposure were 80 percent more likely to have abnormal or borderline scores on tests evaluating emotional problems, conduct problems, hyperactivity, or problems with peers.

Risks were higher for children exposed prenatally only, compared with those exposed only postnatally, but were lower than for children exposed at both time points.

Kheifets notes that a fetus's exposure to radiofrequency fields by a mother's cell phone use is likely very small. However, they add, research has shown that children using cell phones are exposed to more radiofrequency energy than adults, because their ears and brains are smaller.

Because cell phone use was so infrequent among children in the study - 30 percent of kids were using a cell phone, but just 1 percent used a cell phone for more than an hour a week - radiofrequency exposure seems unlikely to have caused any behavior problems, they say.

"Another possible explanation for the observed association might be the lack of attention given to a child by mothers who are frequent users of cell phones," the researchers suggest. They note that mothers who used cell phones frequently were of lower socio-occupational status, more likely to have mental health and psychiatric problems, and more likely to have smoked while they were pregnant.