While most of the evidence is anecdotal, it does sometimes look like big events, especially those which are a bit traumatic can result in a baby boom afterwards.
Possibly it may be to do with the power cuts and the closing of other places to go, or perhaps for those more poetic the need to be close to the ones we love in troubled times, but it does appear that baby booms do follow big events. In 2002 following the tragedy of 911 in New York the number of births grew by 20%, and going further back in 1966 following huge electrical blackouts nine months later hospitals reported a short period where the number of births were doubled from the average.
