Ms Haga said the interviews highlighted a number of risk factors apart from biological ones。

'It’s not the need for control in itself, but rather the failure to achieve specific expectations that can trigger a depression,' she said。

'In contrast, women who take a more relaxed approach to motherhood with more undefined expectations cope better with unexpected challenges.'

Other women struggled after the delivery left them 'feeling like a failure'。

One new mother told Ms Haga she struggled after having an unplanned caesarean section: 'That wasn’t how I was supposed to have a baby. I was so tired and so disappointed, I was so sad,' she said。

'I hadn’t been able to give birth to my baby; someone had to do it for me.'

'In my study the women who had the greatest need for control often had the strongest wish to have a natural birth,' Ms Haga noted。

科学家称，那些等事业有成再要宝宝的女性更容易患产后抑郁症。

一项研究表明，高龄母亲更倾向于为第一胎宝宝做过多准备，当事情不按计划发展时，就会很纠结。

这一研究发现对于英国人而言意义重大。在英国，越来越多的女性选择在经济上有保障后再生宝宝。

研究领头人、来自挪威奥斯陆大学的西尔杰•玛丽•哈加说：“有一些迹象表明，初次生育年龄更大的母亲更容易得产后抑郁症，这可能是因为她们习惯于掌控自己的生活：她们已经完成了多年的学业，并在生育前事业有成。

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