A story in RedOrbit has confirmed what has been doubted for a longtime. A new study has linked pregnant mothers’ cell phone usage to the birth of children with behavioral problems. According to RedOrbit Overall, 13,159 children were observed in the unprecedented study. Researchers found that mothers who used cell phones at least two or three times each day brought increased risk of developing hyperactivity to their children.

Difficulties with conduct, emotions and relationships were also noted among children by the time they reached school age.

Researchers from the universities of California Los Angeles and Aarhus, Denmark were stunned at the results of the study, which will be published in July’s issue of the journal Epidemiology.

One researcher involved with the study has been skeptical about the potential health dangers of cell phones.