Group 2: for children weighing 15 - 25 kgs (33 - 55 lbs), roughly 4 to 6 years. Booster seats that only fit into Group 2 are less common. Most are group 2 and 3, or groups 1, 2 and 3. Groups 2 & 3: for children weighing 15 - 36 kg (33 - 79 lbs), roughly 4 to 11 years.
Broil the ribs for about 5 minutes, until the sugar in the dry rub is bubbling and the ribs are evenly browned. Bake the ribs: Set the oven to 300Â°F. Move the ribs to an oven rack in the middle of the oven. Roast for 2 1/2 to 3 hours for spare ribs or 1 1/2 to 2 hours for baby back ribs. Halfway through cooking, cover the ribs with aluminum foil to protect them from drying out.
Place the ribs in your oven, and slow-roast them for 3 to 3 1/2 hours or until a rib bone turns easily when rotated. If you like your ribs to have a cooked-on glaze, baste them repeatedly with your preferred sauce during the last hour of cooking. Alternatively, glaze them at the end of their cooking time, then increase the oven temperature to 500 F for 5 to 8 minutes, until the glaze is caramelized. Step 5