- The baby was taken to hospital by ambulance from an address in Bow on Friday
- London Ambulance Service contacted police at 5.30pm due to the condition of the girl. She was dead by 5.45pm
- The woman, who has not been named by the police, was arrested on Saturday and later charged
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Paramedics were on standby outside the police cordon as armed officers stood by the property.
A team of researchers has taken samples from the ten busiest London Underground lines to work out which are the dirtiest.
The action comes on top of an emergency timetable which has seen hundreds of trains a day being axed.