Dr Obel suspects the immediate cause is that male pregnancies are more likely to miscarry in response to stress than female pregnancies are, especially during the first three months.

• 欧贝尔(Obel)博士怀疑直接原因是在压力之下怀有男婴的孕妇比怀有女婴的更易流产，尤其是在头三个月内。