Mother hears dead baby's heartbeat inside 4 year old transplant recipient

A woman whose seven-month-old son died after being reportedly abused by a babysitter's boyfriend donated his organs - and has now heard the boy's heartbeat in a young girl.

Heather Clark couldn't hide her emotions as she listened to the heart of four-year-old organ recipient Jordan Drake at Phoenix Children's Hospital.

Donate Life Arizona wrote on Facebook Saturday: 'Amid the unthinkable grief of losing her son Lukas, Heather made a decision that saved three lives.

'Jordan received Lukas' precious heart when she was just 18 months old. 'Yesterday, Heather heard her son's heartbeat for the first time in nearly three years.'

Clark and Drake's mother, Esther Gonzalez, were filmed by KDVR crying and hugging while meeting one another for the first time.

Gonzalez was heard telling Clark: 'I just can't believe this is happening.'