Mrs Pelham suffered from post-natal depression after her first daughter Isabelle was born in 2009 and again after she gave birth to Abigail two years later.
�I experienced difficulties post-birth with bonding and found it hard to cope with what was supposed to be a joyous time,� she said. �I had feelings of guilt and frustration, it made me wonder whether I was a good mother.
�I was yelling at a little baby then feeling guilty; I knew logically it was not the way to react.�
Mrs Pelham said her illness intensified after the birth of her second daughter but she finally sought help and was diagnosed with post-natal depression.
�Going on medication gave me the chance to unwind,� she said.
Mrs Pelham started taking part in community races two years ago, running while pushing her daughters in a pram.
�It has been a long struggle but I am finally beginning to see the light at the end of the tunnel and running has been my saviour,� she said.
She will take part in the City to Surf marathon on August 30 while pushing four-year-old Abigail to raise money and awareness for The Black Dog Institute.
�I have become passionate about drawing attention to mental health issues through my own experience and decided to take this one step further and fundraise for the institute,� she said.
�You never expect it�s going to happen to you and knowing other people are experiencing the same thing is really encouraging.
�I want others to know it can happen and it�s nothing to be embarrassed about.�
She is also starting a group for northern suburbs mothers suffering from similar mental health issues. �It will be a supportive environment, where people can come without feeling judged,� she said.
�I want them to feel like they�re not alone, they�re not the only one who hasn�t bonded with your child or fallen in love with your baby straight away. Seeking help is the biggest thing because it�s not you, it�s actually something going on in your brain.�
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