it really just depends on how tall you are and your family history. if both of your parents are fairly slim and don't weigh that much, and you are, say, 4'10'', then no you aren't too underweight. another good way of figuring this out is checking out your bmi : usually under 19 is considered "unhealthy" or "underweight". u can easily check your bmi over the internet: just Google 'bmi calculator' and click on a link.
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It may be on the low side of normal. Without knowing his ethnicity and body build the height-weight chart shows an average 11-year old boy is 52 inches tall and weighs 77 pounds. These are averages, everyone develops differently. Consult your son's pediatrician if you have concerns.
That's something you should ask your doctor about. Finding a healthy weight for you depends on many factors like height, frame size, activity level, etc.
Please click on the page link directly below. This will help you. http://wiki.answers.com/Q/What_is_a_normal_weight_for_a_child_of_a_certain_height_and_age