Dozens of people took part in the Heartkids Two Feet and a Heartbeat Charity walk on Sunday.
Among them were Charlotte Miller, 2, who spent the first six months of her life in hospital and has been in and out of the Royal Children's Hospital ever since.
She was born with a serious heart condition and has undergone open heart surgery three times.
Charlotte has the congenital heart defect Tetralogy of Fallout along with tachycardia - her heart beats out of rhythm and too fast, hitting 320 beats per minute on one occasion.
Her mother Emma Miller said her daughter would likely have to undergo surgery in October or November this year.
The Crawley family also took part, with 10-year-old Ben waving the flag as a survivor.
He had open heart surgery when he was just two weeks old but is now fighting fit.
The walk was held to raise awareness about the four lives lost each week to congenital or acquired heart disease.
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