I'm sure parents are a good way to predict many factors relating to their offspring. Size, tempermant as well as health issues are often passed down from generation to generation. My 5 month old, who is a tad over 45lbs, has a father who weighs around 75lbs, and his mother probably around 60lbs. The grandfather however was a big boy. So i'm guessing Yoda, the 5 month old, might be taking after his grandpa.