The parents of an 11-week-old baby, in desperate need of a heart transplant, are urging people to consider organ donation.
William Jones was diagnosed with a rare condition when he was just a few weeks old.
His heart muscle is thin and stretched and cannot pump properly to squeeze blood around his body.
He is currently the youngest child in the UK on the urgent heart transplant waiting list.
Any donated organ would have to come from a baby of a similar size and weight to the 11-week old.
Now parents Laura Osborne and Stuart Jones, from Hemel Hempstead, are using their first child's plight to urge people to consider signing up as organ donors.
Laura, 35, said: "I've been a registered organ donor for a long time but it hadn't crossed my mind to think of children donating until now.
"Now we will rely on a family agreeing to donate - William has no future without a heart transplant.
"Hearts in William's size don't come about all that often.
"We hope people will see his story and think about organ donation."
She added: "We are terrified, he could deteriorate at any point...I don't know if my baby is going to survive this or not. But he is here, you can see the fight in him."
He is currently on life support at Great Ormond Street Hospital in London.
Laura's pregnancy went smoothly and William arrived by emergency caesarean section, but at home he struggled to feed, was very sleepy and was eventually diagnosed in hospital with dilated cardiomyopathy.
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Angie Scales, lead nurse for paediatric organ donation at NHS Blood and Transplant, said: "For William and lots of children waiting for a life-saving transplant, their only hope is the parents of another child agreeing to organ donation at a time of immense sadness and personal grief.
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"We urge parents to think and talk about organ donation for themselves and their family today. Your decision could help save lives."
There are currently more than 7,000 people in the UK, including 250 children, waiting for an organ transplant.
Nearly 300 patients need a heart transplant, including 38 children.
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