It's always nice to be able to cite scholarly articles I may have encountered in my past life as a neuroscience student in calling for voters to abandon the conservatives in droves.
If the Camerons want a healthy, happy, well-adjusted child then they should be hoping for a crushing defeat in the coming election. No need to move house (one of the most stressful life events we go through as humans apparently), and no insane media circus following your every move. Samantha Cameron could just relax, eat well and look forward to a happy life with a laid-back, chilled-out, back-bench MP.
Stress during pregnancy can have considerable effects upon foetal brain development and future behavioural problems. So, for the sake of #Camspawn and its Camhost, don't vote Conservative.