The newborn was discovered wrapped up in a towel and a shopping bag late last night in a park near to Roman Road and Saxon Road.
Police say she was found by a woman walking a dog, who heard the baby crying.
The child is being cared for in hospital and she is in a stable condition.
Hospital staff are unofficially referring to her as “Roman”.
Police are concerned that the mother may need urgent medical treatment.
In a direct appeal to the child’s mother, Inspector Shane Clarke said: “We are growing increasingly concerned for your welfare and I urge you to make contact either with police, your local hospital or GP surgery. It is really important that we know that you are safe.
“I would also urge anyone who has information that could help us to reunite this baby with her mother to come forward.”
Anyone with information as to the whereabouts of the mother is asked to call police on 101 quoting reference CAD7825/31JAN or Tweet @MetCC.Tags: Newham, East Ham
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