Megan Huntsman, 39, who lived in the Utah home until three years ago, had the infants between 1996 and 2006, investigators said.
Officers responded to a call Saturday from Huntsman's estranged husband about a dead infant at the home, police Capt Michael Roberts said. Officers then discovered the six other bodies.
Roberts declined to comment on a motive and what Huntsman said during an interview with investigators.
"We don't believe he had any knowledge of the situation," Roberts said.
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Asked how the man could not have known if he lived in the house, Roberts replied, "That's the million-dollar question. Amazing."
The babies' bodies were sent to the Utah medical examiner's office for tests, including one to determine the cause of death. DNA samples taken from the suspect and her husband will determine definitively whether the two are the parents, as investigators believe.
Huntsman's three daughters still live there, longtime neighbor Sharon Chipman told The Salt Lake Tribune. The oldest are around 18 to 20 years old, while the youngest is about 13, she said.
Huntsman was a great neighbor, and Chipman trusted her to watch her grandson when he was a toddler, Chipman added.
"She took good care of him. She was good. This really shocks me," Chipman told The Tribune.
Roberts said the case has been "emotionally draining" and upsetting to investigators. He was at the home when the bodies were discovered.
Huntsman was booked yesterday into the Utah County Jail on six counts of murder. Roberts said it wasn't clear if she has an attorney.