Previously it was thought that couples with daughters were more likely to get divorced either because men had a preference for sons or daughters empowered their mothers to leave a difficult relationship.
So having daughters had a negative effect on relationships – but new research by economists at Duke University in North Carolina suggests that it’s the other way round. Because female embryos are more robust than male ones they are more likely to survive the stress of a bad relationship.
Usually there are 105 boys born to every 100 girls but during times of extreme stress or upheaval such as earthquakes or famines more girls are born.
US census data showed that fathers are less likely to be living with their children if they have daughters rather than sons. Mothers who reported high levels of marital conflict were more likely to go on and have baby girls.