The authors of a new study into maternal depression said their findings make a "compelling" case for a rethink in approaches to how to support mothers.
Dr Hannah Woolhouse, psychologist and senior research officer said:
It is likely that current systems of maternal mental health surveillance in Australia and the UK will miss more than half the women experiencing depression in the early years of parenting.
In particular, women who do not have subsequent children may be especially vulnerable to falling through the gaps as they will not be reconnected back into primary care services.
There also needs to be a focus on social health and relationships as we have found a strong link between depressive symptoms and intimate partner violence.
More top news
Could you imagine having 20 jobs at the age of 67? Tonight we meet the man who is doing more than most on the island of North Ronaldsay.
Many apparently healthy snacking dips are "salt and fat traps" loaded with calories, according to a study.
The EU referendum campaign brought extravagant claims on how Brexit might impact the housing market - but what's the reality?