Toronto police are pleading with the parents suspected of abducting their five-year-old daughter to get medical help for their child.

Investigators say the girl, Alana Livas, is suffering from rickets, and without ongoing treatment could have heart problems, which could lead to breathing difficulties.

"We are certain that the parents are not aware of the seriousness of her condition as this diagnosis was made after the child was taken from them by Children's Aid Society (earlier this year)," Det. Sgt. Rick Searl said a news conference late Monday afternoon.

Police allege Peter and Vivene Livas took their daughter from a Children's Aid Society office in Toronto last Thursday without permission, and then drove away. Detectives say the girl doesn't have the medicine and vitamins she needs.

Police initially said the couple may have been driving a light-brown Acura Integra, however, that vehicle was found in Scarborough on Monday. Its licence plates had been removed.

Investigators are now looking for a light-blue 1998 GMC Jimmy. The driver may be using as many as five different sets of licence plates, police said.

Anyone with information is asked to contact police or Crime Stoppers at 416-222-TIPS (8477).

With a report from CTV's Matet Nebres