Julie Alison Reynolds, 36, had six children ranging in age from 18 months to 17 years old by three different men. The newborn victim was her seventh child by a fourth man, said Deputy District Attorney Tracy Prior.
As part of her plea, Reynolds waived her right to have conjugal visits while she's behind bars.
"We don't want her having any more children while she's in prison," Prior told reporters outside court.
Reynolds' plea before Judge Robert F. O'Neill came on the day of her scheduled preliminary hearing. The judge set sentencing for July 10.
The defendant, who was originally charged with murder, was allowed to plead guilty to a lesser charge because she expressed remorse and accepted responsibility before a preliminary hearing was held, the prosecutor said.
Prior said it was still unclear why Reynolds smothered her baby hours after he was born.
"That's a $60 million question right there," the prosecutor said. "How could anybody take their child's life?"
At Reynolds' arraignment last summer, Prior said the defendant placed her left hand over the newborn's mouth, killing him. The child's body was found July 30 in a backpack in her bedroom closet.
Prior said Reynolds has a documented history with Child Protective Services in two states other than California.
The prosecutor said the defendant's sister and brother-in-law had welcomed the Colorado woman into their home a few months earlier so she could get her life back on track.
The couple didn't know Reynolds was pregnant, but noticed some weight gain and repeatedly asked the defendant if she was with child, but Reynolds denied it, Prior said.
The weekend before the killing, the couple became extremely suspicious when they noticed Reynolds' weight loss and found blood on the carpet in her bedroom, the prosecutor said.
The brother-in-law went through the trash and found a plastic bag with bloody towels, then went to the police for help, Prior said.
When officers arrived, they found the 6-pound, 19-inch baby in the backpack, the prosecutor said.
Prior said the defendant knew she had the option of dropping the newborn off at a police or fire station, having her family help or giving the child up for adoption, but chose none of the options.
The defendant's six children are in protective custody and her relatives offered to take care of them, Prior said.
A man arrested on suspicion of committing a murder in Imperial Beach earlier this week remained jailed Saturday.
Spencer Abbott had two goals and two assists after missing two games and Eric Fehr scored twice in his debut with the San Diego Gulls in an 8-3 victory over the Tucson Roadrunners Friday night.
A sea of pink will travel through San Diego starting Friday for the Susan G. Komen San Diego 3-Day. The 60 mile journey kicks off early Friday morning and ends Sunday evening at the final destination – the celebratory Closing Ceremony.
On Friday, a fourth woman came forward with disturbing allegations of sexual assault by a San Diego County Sheriff’s Deputy.
Malcolm Young, the rhythm guitarist and guiding force behind the bawdy hard rock band AC/DC who helped create such head-banging anthems as "Highway to Hell," ''Hell's Bells" and "Back in Black," has died.
One person was killed Friday in a crash involving a motorcycle on northbound Interstate 5 in Carlsbad.
Covet Canyon, a paramilitary training camp in the East County, is in financial trouble after the owner defaulted on property payments. Owner Marc Halcon has 90 days to make good on the debt or the 160 acre property could fall into foreclosure and auction.
Angry Poway Unified School District parents on Friday packed the sidewalk calling for a local teacher to be fired after sending inappropriate text messages to a teenage student.
The unemployment rate in San Diego County dropped to 3.7 percent last month from 4.1 percent in September, according to state figures released Friday.
Black Friday is a week away, but many retailers are now making you wait. This year, companies are offering discounts the entire week leading into Black Friday. News 8's Eric Kahnert reports on some of the goods you can get during Black Friday "week."