Stress in pregnancy is more likely to lead to the birth of a girl, a study found.
There’s also a higher risk of premature birth among stressed mums-to-be. On average around 105 males are born for every 100 females.
But among women experiencing physical and psychological stress, thechances of having a daughter rose to ratios of 4:9 and 2:3 respectively.
Results were compared with patterns seen after the 9/11 terror attacks when the number of newborn boys decreased.
Previous studies found males are more vulnerable to adverse prenatal environments.