Magnolia died at just 10 days old after catching the cold sore virus. Her mother never knew the danger.
She was born healthy after a straightforward water birth in Staffordshire. She was nearly two weeks overdue.
Meg Edmonds, 22, noticed a sore on her lip around the birth. She had never had a cold sore before.
Meg asked health professionals about the sore. They reassured her it was nothing serious. She believed them.
She never kissed her baby. She washed her hands constantly. She kept unwell visitors away from the house.
It is suspected the virus passed from Meg's cold sore to her newborn. Magnolia's condition quickly got worse.
A newborn's immune system is still growing. The NHS says babies face the highest risk in their first six weeks.
The virus spreads through contact with a cold sore. That includes kissing a baby with an active cold sore.
The Lullaby Trust says: think hands and no kisses. Wash your hands before touching your baby. Never kiss if you feel unwell.
Poor feeding, unusual irritability, fever of 38C or higher, rashes or sores, or being hard to wake. Seek help fast.
We did not know a cold sore could kill a baby, she told the BBC. Now she wants every parent to know.
The full explainer covers every NHS safety step for parents and visitors. Tap below to read it now.
Get the full breakdown, key numbers, and what happens next.
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