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A Northern California woman was arrested this week in connection with the death of her 2-month old baby, who died of acute methamphetamine poisoning, police said Tuesday.

The two-month old infant passed away in June at a hospital after experiencing symptoms including choking and difficulty breathing, according to a news release from the Fairfield Police Department.

An investigation began the following month after the infant’s cause of death was determined.

During the course of the investigation, Fairfield police identified the mother as 21-year-old Shelby Frederick, and determined that she had full care and custody of the child, the release stated.

Frederick, who is five months pregnant, was detained on Dec. 30. She was subsequently arrested and booked into Solano County Jail on a charge of assault of a child causing death, according to the release.

An investigation into the child’s death was ongoing, police said.