Brown bear weights vary by age, gender, location, and time of year. Bears weigh about one pound (0.5 kg) at birth and attain adult size by age 6. Adult males tend to be 30-50% larger than females. A large male may weigh up to 1,500 lbs (680 kg) in coastal areas or up to 500 lbs (227 kg) in interior areas. Bears weigh the least when they emerge from their dens in the spring, and can increase their weight by over 50% during late summer and fall. The largest brown bear ever killed had a skull that was 17.9" (46 cm) and 12.8" wide (33 cm). Such a bear, when standing on its hind feet, would be over 10' (3.0 m) tall.
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That all depends on the age of the cubs. Are you talking about the birth weight of a bear cub or later on in life?