babies born in the US.
The most recent stats I found for Missouri were from 2016. Like most of the developed world our birth rate has been falling.
https://health.mo.gov/data/focus/pdf/FOCUS_16.pdf
Missouri Births
2006 81,353
2015 75,042
2016 74,664
So, if birth rates stopped dropping in Missouri, the number of anchor baby births in the US (~ 372,000) would have been almost 5 times as many as all of the births in Missouri (including the anchor baby births that occurred here, of course).
Edited by JeffB at 22:41:00 on 01/05/20