One a day, plus iron

Well, let's take a trip to nightmare territory. I got my incidence data from here where they define "precocious puberty" as menarche before age 8. High end: 1 in 5000. Low end: 1 in 10,000. Ratio is 10 F to 1 M occurrence.

Counting only the incidences from the span 2000 to 2010 (inclusive), there are 31 persons under the age of 11 who have given birth. Ballparking population growth from 1990 to 2000 (the people who would more-or-less be the "right age" to be a baby mama in the subset we're talking about) we have 804,326,640 persons more in 2000 than we did in 1990. So, let's call that 800,000,000 persons because math is hard and I'll probably fuck up copying anything more complex into my calculator.

Of those 8,000,000,000 persons, the "low end" estimate for incidence of precocious puberty is 1 in 10,000 persons so we have 80,000 persons with precocious puberty, probably. Of those 80,000 persons, there are 10 girls to every 1 boy. So, 7273 boys, 72,727 girls. Looking better, right? Right?

For an ordinarily healthy couple having regular (twice a week) unprotected sex, odds are 9 in 10 that they will get el preggo after a year of doing the deed. So we'll assume that OF THE pp girls being fucked regularly (ew), 90% of them knock up. (Seems legit. Plus also I'm just spitballin' here.) So we have 31 girl-mothers out of a population of 72,727 pp girls. I just decided that 31 is 90% of the pp girls (assuming stats match up to "normal healthy couples" fertility rates which is a big assumption, but I'm out of better ideas). So, 34 precocious puberty girls were probably being regularly fucked in the cohort of 72,727 precocious-puberty girls from 1990 to 2000. That's 0.0468% of pp girls.

In our ten year cohort, we had 800,000,000 kids. 400,000,000 of them are girls, more or less. So, doing the math, that's 186,800 regularly-raped little girls (10 or younger) in the cohort from 1990 to 2000 (inclusive). That's worldwide.

I would like to point out for the record here that wikipedia page does not track births to 11 year old girls, likely because (select least-horrifying option from the following): there are too many to list OR nobody cares OR that's perfectly unremarkable.