The baby’s body was found on Sunday in a chimney in the family’s home in St. Petersburg, Florida.
Authorities say a man found the child’s body in the chimney on Friday, and authorities say they have no suspects in custody.
“It is an unusual finding, especially when we know there is no other way to dispose of the body,” said Chief Deputy Sheriff Scott Jones.
“It is a difficult and emotional situation for the family.”
Officials said the boy, who was 6 months old, was found in a small, sealed-off area in a closet and a trash can.
He was pronounced dead at the scene.
The family was not immediately available for comment.
Authorities said there was no sign of foul play.