A spokeswoman for London Ambulance Service said: "We were called just before 12.40 today to reports of an incident in Eltham High Street, and sent one crew.
"Our staff treated a baby boy who had been taken unwell, who was taken to Queen Elizabeth Hospital, Woolwich."
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On the lawns of the palace, thousands of people stood silently in tribute to the 22 people killed in the blast and the 59 injured.