Police found the child’s body while searching a garden in Birmingham.
West Midlands Police said last week they were searching the yard of a house on Clarence Road in Handsworth and received information that a child had died in the area.
The investigation follows the arrest on December 9 of a 40-year-old man and a 41-year-old woman on suspicion of causing or facilitating the death of a child and another case of willful neglect.
Both have been charged with negligence and are being held in custody. A post-mortem examination will be performed.
Police said the current occupants of the Clarence Road property were not involved in the investigation.
Earlier this week, Army Public Protection Corps DI Joe Davenport said: We understand that this will come as a shock to the community, but please do not speculate about the situation. ”
Inquiries are ongoing.