An 11-month-old girl has sadly died in a Melbourne hospital, just days after her family launched an appeal to help find a stolen phone which contained priceless family photos.

The news comes just days after her father, Jay, appealed for help finding a mobile phone stolen at a local shopping centre, which contained hundreds of photos of baby Amiyah's final days alive.

Jay shared an emotional tribute on social media yesterday, sharing the sad news.

"Amiyah's last hours were spent peacefully and calmly, cuddling in Mummy's and Dady's arms," he said.

"Amiyah battled hard and fought undiagnosed neurological issues from the day she was born.

"Her strength, courage, and her unrelenting fight was on display from her first breath".

It is with utter sadness that Dee and I inform everyone that Amiyah Victoria grew her wings at 2.05am on Wednesday morning. Amiyah's last hours were spent peacefully and calmly, cuddling in Mummy's and Daddy's arms - which is what she loved most. Amiyah battled hard and fought an undiagnosed neurological issue from the day she was born. Her strength, her courage, and her unrelenting fight was on display from her first breath, all the way till her last. She held on and fought every minute to stay cuddling with her Mummy and Daddy for as long as she could and we can't begin to describe how brave and courageous she was. As incredibly empty as we are feeling right now, we are relieved that Amiyah is no longer in any more pain or distress. Although this came on quite suddenly, Dee and I noticed a regress recently and we've been mentally aware that this day would come at any time. Amiyah knew how much we loved her and in return, we knew how much she loved us. We could tell in her gaze whenever she looked at us. It was an extremely challenging 11 months for the 3 of us, but in those 11 months Amiyah inspired many and touched everyone she met. Amiyah taught us so much as people, and as parents, and made Dee and I stronger. Amiyah has given us more courage and strength than we ever knew possible. She pushed us to our limits constantly, but we continuously found ways to push them further. Amiyah turned our relationship and home into a family and we will forever be grateful that she chose us as parents. We will never stop thinking about you and those chubby cheeks. That infectious big toothy smile that you would show us when we cuddled with you will stay in our minds forever. We know that you were made up of a bit of Mummy and a bit of Daddy, so you will always have us with you where ever you go. No matter what, you will forever be in our hearts and we are so proud you. We will never have to see you grow old and frail. You were just absolutely perfect in our eyes and will forever be our beautiful little bubba. We love you endlessly bubba. Love Mummy and Daddy. Amiyah Victoria Windross 21/05/2018 - 24/04/2019

There has been no development in regards to the missing phone, and the family has no backup available to access the precious photos.

A cash reward is being offered, with tens of thousands of Australians joining together to help locate the photos.

Someone has picked up Dee's phone from a toilet next door to Target in Chadstone around 5:30 pm. It is a Samsung Galaxy S8 with a purple cover. Our 11 month daughter is currently deteriorating in ICU and is in her last days with us and this phone holds all our memories of her. We understand that you have either found a new phone to use, or you can sell it to make money, but please understand that this means more than money to us. This is worth life to us. If it's money you need, we will gladly offer you a cash reward for the return of the phone. No questions asked. No grudge held. We beg you as grieving parents not to wipe the phone. This phone holds the memories of what little life our daughter has had. If you want the phone, we're more than happy to arrange to meet, we'll copy the photos off the phone and you can keep the phone. What is on the phone is worth more than anything in our life. I'd like to make this transaction amicably and without the intervention of the police. If you have the phone, or know of its whereabouts - please call 0407527513 or if you want to remain anonymous - please drop the phone off to reception at Monash Children's Hospital or any information desk at Chadstone. Can everyone please share this around!

Anyone with information is urged to contact reception at Monash Children's Hospital.