The B.C. tot who was diagnosed with a rare blood disease at just five weeks old has lost her battle against the disease.

Molly Campbell, dubbed “Baby Molly,” was the youngest person in history to undergo chemotherapy at BC Children’s Hospital, in late 2010.

On Wednesday morning, family friend Emma Irwin posted an announcement on a webpage dedicated to the youngster’s fight against cancer.

“I am heartbroken to tell you that the beautiful, inspirational Molly Campbell passed away this morning,” she wrote.

“Your support has meant so much, and I know the Campbell family will appreciate additional prayers and love in the coming weeks. No family should have to go through this.”

Molly was just two and a half years old.

The young Vancouver Island girl beat acute lymphoblastic leukemia in Oct. 2011, after doctors told her heartbroken family the infant only had a 20 per cent chance of survival.

She spent a full year living a healthy, normal life with her family, but in late 2012 it was revealed the leukemia cells regenerated – and she relapsed into the disease.

Molly’s parents and four siblings moved to Tennessee last fall so she could receive special care at St. Jude’s Children’s Research Hospital in Memphis.

Last month, she suffered a series of severe seizures and was put into intensive care as doctors tried to diagnose the problem.

Molly was set to undergo an experimental stem cell transplant called a “Haplo Transplant.”

When her conditioned worsened, Molly’s father David left a message on their website praying for the recovery of their precious child.

“Ask God for another miracle to save our little baby,” he wrote. “She has so much more to give the world! Please help her!”

To leave a message or donation for Molly's family, click here