Did 911 address confusion lead to baby's death?

BRONX (WABC) -- A Bronx mother is mourning the death of her 5 month old baby. It was a death she says could have been prevented if first responders had gotten there sooner.

It may seem hard to believe that a $2-billion dollar state-of-the art 9-1-1 system would take 30 minutes to dispatch an ambulance to the scene of a dying baby, but that's exactly what Julia Knight is claiming.

The memorial outside her Bronx apartment house helps ease the pain, but not the anger over the loss of her baby daughter. Last Friday, Knight discovered 5-month-old Isabella unconscious next to her in bed. She immediately called 911.

HOFFER: "You gave her what address?"

KNIGHT: "I gave her 450 East 169th Street."

HOFFER: "Clearly?"

KNIGHT: "Clearly. Clear as day. She kept saying, 'Ma'am that's a bad address, a bad address.'"

The address is clearly marked on the building, but for some unexplained reason, Knight says the dispatcher kept pushing back.

"I kept giving her the address - 450, 450, 450. She kept saying that's a bad address, a bad address. No. It's not," Knight said.

She says the dispatcher tried instructing her on CPR. Twenty four minutes after calling she says police arrived and radioed an ambulance, which got their 5 to 10 minutes later and rushed her baby to the hospital. A heart monitor showed it was too late.

"It was a straight line and the doctor said time of death 8:10," Knight said.

Knight blames the delay in part for Isabella 's death. A loss made more tragic by the fact a fully equipped EMS station house is just four blocks away from Knight's apartment.

"How could you not find this address? I don't understand," she said.

Last summer, the 911 system came under fire when a delay occurred in response to a car crash that killed 4-year-old Ariel Russo. A Department of Investigation report blamed the dispatcher who did not take steps to view and process the incident and instead, went on a break. It is still unclear exactly what happened in this latest delay involving a dying baby Isabella, but the loss is unmistakable.

"I'm trying to get that image out of my head from seeing her unconscious, trying to get that image out of my head, just the happy times, just going to remember the happy times," Knight said.

An NYPD spokesman says the matter is being reviewed internally and the 911 dispatcher has been reassigned.