Television channels showed rainwater flooding the medical facility's premises in Parel in Central Mumbai.
The flooding forced doctors to shift the patients in the paediatric ward on the first floor and to the second floor, they said.
The hospital is run by the Brihanmumbai Municipal Corporation.
Torrential rains pounded the metropolis throughout the day today. The city gauged a whopping 298 mm of rainfall, the highest in a day in August since 1997.
One millimeter of rainfall is the equivalent of one liter of water per square meter.
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