A 25-year-old woman was charged Saturday in the death of her baby who police say was left in a garbage bag outside a Bay Ridge home.

According to police, Laura Sergio went to the hospital Friday night with a medical problem. A doctor called authorities to say she might have given birth. Investigators said they found the baby girl unconscious on Saturday on the back porch of Sergio's parents' Colonial Road home.

A medical examiner ruled hypothermia and asphyxia caused the death.

Police say two of Sergio's sisters have also been charged in connection with the case. One faces a charge of improper disposal of a body, and the other is charged with obstructing governmental administration.

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