BBC: John Simpson's full report.
The specialist, like other medical staff at the hospital, seemed nervous about talking too openly about the problem.
They were well aware that what they said went against the government version, and we were told privately that the Iraqi authorities are anxious not to embarrass the Americans over the issue.
There are no official figures for the incidence of birth defects in Falluja. The US military authorities are absolutely correct when they say they are not aware of any official reports indicating an increase in birth defects in Falluja - no official reports exist.