A woman from south-east London who gave the baby of a complete stranger a feeding bottle containing bleach has been given a hospital order.
The 11-month-old boy drank some of the liquid and vomited after being handed the bottle in a branch of McDonald's, Woolwich Crown Court was told.
Elaine Joyner, 53, of Vaughan Williams Close, Deptford, was found to have administered a poison or noxious substance so as to endanger life by a jury last month.
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Scotland Yard said the male youths will appear in custody at Westminster Magistrates' Court on Saturday.
The family of Oliver Dearlove urged people to "think again" before using their fists, as the man who killed him began a six-year jail term.
London Fire Brigade took Southwark Council to court on four charges in relation to safety breaches at Lakanal House in Camberwell.