Dad Dave Fletcher, 39, thought he was capturing a tender childhood moment when he pictured daughter Izzy dozing off at a playground when she was 23-months-old.
But just a few weeks later Dave and wife Vicky, 37, were left devastated after their toddler daughter's tiredness turned out to be a sign that she had leukaemia.
What are the signs of cancer in children to look out for?
These symptoms do not necessarily mean someone has cancer. Cancer symptoms can be very similar to those of other childhood illnesses. And they vary between children. The symptoms listed below are not usually cancer, but please see a doctor if your child has any of these symptoms:
Unable to wee or has blood in their wee
An unexplained lump, firmness or swelling anywhere in their body
Feeling tired all the time
Persistent abdominal pain or swelling
Back pain or bony pain that doesn't go away
Frequent infections or flu-like symptoms
Unexplained seizures or changes in behaviour
Unexplained vomiting (being sick)
Headaches that don't go away
Unexplained weight loss
Feeling short of breath
Frequent or unexplained bruising, unusual paleness or a rash of small red or purple spots that can't be explained
Chances in appearance of the eye or unusual eye reflections in photos