some of data here:
8% of ALL children born in the United States are born to illegal immigrants.
http://politics.blogs.foxnews.com/2010/08/11/illegal-immigrants-bear-8-children-born-us
Costs on average for every illegal alien headed household about $19,600 more if they consume the city services than they pay in taxes, so the rest of the taxpayers have to part costs. Schools become overcrowded, English as second language programs push out other programs.
70% of the births at Parkland Hospital in Dallas are born to illegals.