Four months, numerous doctors and specialists, and a battery of tests later their 15-month-old daughter Rosannah Gundry was found to have a tumour the size of a soccer ball in her abdomen.

After further tests, Rosannah was diagnosed with stage 3 neuroblastoma cancer and has started chemotherapy to shrink the tumour enough for it to be surgically removed.

To assist, Rosannah's aunty Jessica Searle created a fundraising page on Go Fund Me to purchase a new, more comfortable pram and a new lining or mattress for her hospital bed.

"She is uncomfortable, sore and frail. She is only going to get more uncomfortable the more treatment she receives," Ms Searle said.

Rosannah, who was born in Baradine, currently weighs 11 kilograms, around seven kilograms of which are believed to be tumour.

Ms Searle said Rosannah was expected to stay in Westmead Children's Hospital for at least six months, 447 kilometres away from her home and family.

"Rosannah was born with this tumour. It is devastating to know that it has been unnoticed, untreated for so long," Ms Searle said.

Despite her parents remaining by her side, Ms Searle said they were unprepared physically, emotionally, psychologically and financially.

Donations can be made through www.gofundme.com/sweetbabygirl and more information can be found at www.facebook.com/sweetbabygirl2013.