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They should be almost room temperature before placing them in the oven. Leave the oven on, as you will be returning the ribs to cook with the sauce. At this point, the meat should begin to pull away from the bones and the bones should be loose in their sockets. If your baby back ribs were starting to dry out when you added the sauce, reduce the cooking time to about 20 minutes.
Preheat your oven to 300F (149C), (150 degrees Centigrade). Remove the baby back ribs from the refrigerator and let them sit on the counter while the oven preheats. Cook the ribs for 2 hours and then remove them from the oven. Open the foil carefully and check the ribs to see if they are cooking properly. Pour the purchased or homemade sauce over the ribs and close the foil. Return the ribs to the oven and cook for 30 more minutes.