A new study has stated that using cell phones during pregnancy leads to problems in behavior in children.

The risk has been seen even higher among those children who use cell phones from an early age of seven, researchers at the University of California and the University of Southern California have found.

The study was conducted on 29,000 youngsters, the researchers found that the chances of getting behavioral problems was more among children who were exposed to mobile phones in the womb and then in early childhood and more in their early childhood as compared to other youngsters.

There was a 30 per cent increase of having such problems among children who were exposed to cell phones in the womb and children who stay safe in the womb but get exposed to cell phones as children are likely to have a 20 percent chance of developing such problems.

Such an association was found by the same team that had conducted the same study earlier also.

About 50 per cent of women had their phones turned on at all times and more than 10 per cent of children exposed to mobile phones in pregnancy had mothers who spoke on them at least four times a day.