MILLVALE, Pa. >> A 10-month-old boy found dead in a Pittsburgh-area apartment is believed to have starved after his 22-year-old mother died of an apparent overdose, leaving no one to care for him, authorities said Friday.

The woman’s brother found the two dead early Friday morning when he went to check on his sister after not hearing from her for several days, Assistant Allegheny County police Superintendent James Morton said.

Morton said the mother may have died a week or two earlier. She was found on her bed, with the child in the living room. He said there were no signs of foul play.

“It’s a very sad situation in there,” Morton told reporters outside the apartment in Millvale, just across the Allegheny River from Pittsburgh. “It seems like he (the infant) tried to survive but there was no food or anything for him to have.”

The woman’s mother died of natural causes in the same apartment in November, Morton said, and no one else lived on the same floor of the apartment building.

Police suspect the woman died of a drug overdose but autopsies were pending.

They were withholding the identities while they tried to contact the baby’s father.