Doctors and researchers from Boston to Sydney are sounding the alarm on the potential risks of using wireless devices during pregnancy, calling for a closer look at technology they say could have serious long-term consequences for unborn babies.More than 100 signatures appear on the notice issued yesterday by The BabySafe Project, a joint initiative of two environmental health non-profit organizations, urging pregnant women to reduce their exposure to wireless radiation emitted by products like cellphones and Wi-Fi routers.