The woman refused to talk, only writing her full name and date of birth on a piece of paper for police. She was taken to Police Hospital for a check-up.
Police said the baby had been dead for at least 24 hours when it was found face down in the canal. There were burn marks on the baby's back, but it was thought he was dead before they were inflicted.
Witnesses said they saw Ms Suban burning what was thought to be a doll because t did not cry out.