Mother Byrd Daycare center in Mariners Harbor was closed after Edward Harris drowned in its pool.
The grandmother of Edward Harris, 3, blamed the daycare center for his death.
Divers pulled Ruhshona Kurbonova's body from the Brooklyn lake Saturday afternoon, police said.
Mayor Michael Bloomberg said the mistake might be attributable to a "bureaucratic error."
A 5-year-old boy died Tuesday in a bathtub in the Elliot Houses in Chelsea, police said.
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