Superintendent Steve Nibloe said: "This is clearly a very upsetting incident and we already have a number of officers dealing with this at the scene and making other enquiries.
"We do not know with any certainty how long the baby has been there or how it has died and while I understand there will be concern in the community I want to reassure residents that we will be working hard to answer these questions.
"If anyone has any information whatsoever, regardless of how insignificant you think it might be, please get in touch.
"We are obviously deeply concerned for the welfare of the mother and if anyone has seen someone in the area or has any information about who you think the mother might be please call us."
Anyone with any information is asked to call police on 101.
More top news
It's still pretty wintry out there although the air over the next 12 or so hours will be fractionally less cold than it has been recently.
CCTV shows an acrobatic youth as he caused £5,000 worth of damage when he ran across six cars before attempting a handstand on a seventh.
Detectives have released CCTV footage of the moment a machete wielding thug wearing a mask jumped over the counter at a bookmakers.