I am looking to get the statistical breakdown of the number of
children
in the USA by age and gender - ie. there are 2 million girls age 5, 3
million girls age 6 etc..
ages 1 to 15

Hi colorwizard,
Below are the age breakdown for children ages 1-15 in the United
States, according to the 2000 census:
Male:
Under 1 year
 1,966,163
 
1 year
 1,935,900
 
2 years
 1,911,382
 
3 years
 1,941,479
 
4 years
 2,000,783
 
5 years
 2,042,785
 
6 years
 2,060,698
 
7 years
 2,110,540
 
8 years
 2,141,661
 
9 years
 2,199,819
 
10 years
 2,196,266
 
11 years
 2,119,014
 
12 years
 2,095,372
 
13 years
 2,067,989
 
14 years
 2,098,930
 
15 years
 2,045,123
 
Female:
Under 1 year
 1,860,846
 
1 year
 1,845,881
 
2 years
 1,825,558
 
3 years
 1,856,008
 
4 years
 1,902,754
 
5 years
 1,936,625
 
6 years
 1,963,728
 
7 years
 2,013,882
 
8 years
 2,048,980
 
9 years
 2,089,564
 
10 years
 2,084,122
 
11 years
 2,013,511
 
12 years
 1,988,557
 
13 years
 1,967,859
 
14 years
 1,986,579
 
15 years
 1,935,471

Source: 
http://factfinder.census.gov/servlet/DTTable?_ts=69184207740
 
I hope that this answered your question.  If you need clarification,
please request for it before rating this answer.
secret901-ga

Search strategy:
I navigated the Census website for the information.

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Clarification of Answer by secret901-ga on 23 Apr 2003 15:58 PDT

Hi,
It seems that the link is only temporary.  To reach the page with more
detailed statistics, go here:
http://factfinder.census.gov/servlet/DTGeoSearchByListServlet?ds_name=DEC_2000_SF3_U&_lang=en&_ts=69184477234
Then Choose Nation, then Add the United States to the List.
Then choose P8-Sex by Age and add it to the list
Click on show table
This should show the table of data.

secret901-ga

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Clarification of Answer by secret901-ga on 23 Apr 2003 16:57 PDT

Hi again colorwizard,
You can reach the referenced type directly here:
http://factfinder.census.gov/servlet/DTTable?ds_name=DEC_2000_SF1_U&geo_id=01000US&mt_name=DEC_2000_SF1_U_PCT012

secret901-ga