In a news release issued Thursday, police said the infant boy was found Nov. 7 in the backyard of a residence on the 700 block of Retallack Street. They were called around 3:30 p.m. CST.
Officers found the remains of a child, which they believe was a newborn, and launched an investigation.
They said they know who the mother is and say the case remains under investigation.
"We still have much to learn about the circumstances of this event," Elizabeth Popowich, spokeswoman for the Regina police, told CBC News Thursday.
She said determining how the child died was one of the things the coroner will investigate.
She added that the child was in a "relatively open" area of the yard.
"It's a death investigation," Popowich added. "And whether or not it's criminal, I think that that's something that it's too early to say."
Popowich could not provide an estimate on how long it may take before more details are known, saying each investigation proceeds at its own pace.