'My baby cried non-stop - and then I got help'
A trial aimed at providing support for parents of babies who cry excessively is being rolled out nationally.
Sophie said her daughter Matilda cried non-stop from seven weeks old to four months.
The mother of two said: "If she was awake, she was screaming.
"Without the support of this study, I would have been in a very dark place."
About 20% of infants cry for prolonged periods during the first four months, according to researchers.
Following successful initial small-scale testing, teams at Nottingham Trent University, University College London and the University of Leicester, funded by the National Institute of Health and Care Research, are working with parents and health visitors across the UK.
Video journalist: Chris Waring
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