The child, who is from the E13 area, was admitted to an east London hospital after falling ill on Friday, 13 September.
She tragically died in hospital the following Tuesday.
A post-mortem examination gave the cause of death as a head injury.
Officers arrested a 36-year-old man on suspicion of causing grievous bodily harm on Saturday, 14 September.
He has been released on bail to return in mid-October.
The child’s next of kin have been informed.
Enquiries continue.Tags: Newham, Plaistow
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