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
European football might not want him, but most of the rest of the world does - and very soon that support will drift into the ballot box.
Thousands of people have signed a petition calling for 'Britain's Hardest Grafter' to be scrapped before filming even begins on the series.
Apple has found a solution to the text message bug that was able to crash users' iPhones.