I would like to know the average height and average weight of second
graders in America in 1900, 1920, 1940, 1960, 1980, 2000. I am
assuming that the average age of this group is 7 years old. I would
like the data broken out between boys and girls if possible. Thanks so
much.

Dear Karoony, 

Thank you for your interesting question. 

However, it seems, that it has better
chances to be answered, if you amended your price. The pricing guide
for $2 - $5 questions:
 
""The Google Answers Pricing Guide:   
   
$2 - $5  ·  Can be answered with a single link or a single piece of  
information. Sometimes, if a researcher is personally interested in
the question's subject, they may provide a longer answer.  
  ·  Not appropriate for multipart questions.    
  ·  Only 60% of the questions asked in this price range are answered.
   
http://answers.google.com/answers/pricing.html"