An 11-month-old baby answered a mobile phone to help raise the alarm when her mother collapsed.
Amelia Boyle picked up the ringing phone after her 20-year-old mother Elizabeth fainted at home in Braintree, Essex.
Grandmother Linda Wright, making the call, heard the baby say "Mama."
Realizing her daughter's history of passing out and having seizures, Mrs Wright feared something was wrong and called an ambulance.
Paramedics attended and found Miss Boyle had woken up, although she was in a confused state.
She was later told that her phone had been answered by Amelia and how her daughter had played such a vital role in getting help in the incident.
Joy Hale, of the East of England Ambulance Service, said: "We often hear of children who help their parents but this is one of the youngest we've been told about.
"The grandmother also did brilliantly in alerting the emergency services. Thankfully, the mother did not need hospital treatment."