Clay County Sheriff Eddie Scott says 24-year-old Brittania Smith was arrested this week.
Scott says a report Monday from the Mississippi Crime Lab determined Brittania’s son, Brinston Smith, died from a lethal dose of codeine.
Scott says the child died on Dec. 20 at North Mississippi Medical Center in West Point, where he was taken by personnel responding to a 911 call.
Scott says the codeine allegedly used in the incident was obtained through a prescription. Scott declined to comment on who the prescription was for.
Smith, who has two other young children, is currently in the county jail awaiting arraignment.