The heaviest body part is the human head.
The head is the part of the human body that weighs the most at 10 to 11 lbs.
The heaviest internal organ of the body is the liver which weighs between 3 lbs to 3.5 lbs.
A human Skull weighs around 8 lbs while with the brain and eyes etc the head and skull weighs around 10 to 11 lbs.
But once the brain and eyes etc are gone from the skull the skull weighs less.
The brain weighs around 3 lbs.
An adult human head weighs between 10 lbs to 11 lbs although some larger persons head may weigh slightly more.
A child's head weighs between 8 to 9 lbs.
Depending on the size of the head the human head weighs between 10 to 11 pounds.
A toddlers head may only weigh 5 to 6 lbs and a babies head may only weigh 1 to 2 lbs.
When a baby is born the whole babies body typically weighs 5 lbs and some ounces however some babies may be less in weight and some babies may weigh a bit more.
So the average babies head weighs around 1 lb to 2 lbs.
An adults head usually weighs between 10 lbs to 11 lbs.
Of course some humans who are more heavier in weight may have a bit heavier head than someone who is skinnier.
The head makes up only a small percentage of the weight a human weighs.