Ronald Greer, 21, Bianca Stanch, 19, and her cousin Rayshawn Stanch, 26, were arrested after a tipster told authorities Greer's daughter, identified as Samiah Downing, hadn't been seen.
During the investigation, authorities searched Greer and Stanch's former residence in Adelanto and uncovered information that led them to search the high desert south of Baker. The little girl's body was discovered in a shallow grave.
No information on how long ago the child had been killed or buried was released.
Greer and Bianca Stanch were booked at the Central Detention Center on suspicion of murder and assault on a child. Rayshawn Stanch was booked for murder and parole violation. The suspects are being held without bail.
Anyone with information regarding this investigation was urged to contact Detective J. Steers or Detective Matt Peterson of the Homicide Detail at (909) 387-3589.