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 baby back ribs into a large boiling pot, such as a 60-quart aluminum stew or stock pot. Fill the pot with cold water until the ribs are covered. Add a dash of salt to the pot. If you are adding dry seasonings or vinegar to the pot, this is the time to do it. Bring the water to a boil, then reduce to a simmer. Cook the baby back ribs until they are tender â about 45 minutes to an hour. You will know the tender ribs have been adequately boiled when the pink and red hues on the outer layers of the raw ribs have turned light brown. Use barbecue tongs to remove the baby back ribs from the pot and place them on a baking sheet.