It's either horrid or a broken machine translation to English.

Not related (at least as far as I can see), but I read a lot of startup materials translated from Portugal Portuguese to English and often was quite confused about what it said, indeed sentences like the gp here. Then I learned Portugal Portuguese proper and found out its sayings and humor that doesn't translate. Mostly because it's not funny (to me, which makes it hard to translate) but also because there is nothing useful to translate it to in English (sometimes there is in Scottish and Irish but often not in England or US english).

It's horrid.

I don't think it's machine translation. The preceding sentence is this:

> The best illustration of “spillover” is the incredible increase in the size of the ass and thighs in girls. This is not due to squatting or implants, because you see it at very young ages.

Why can't this be a simple observation?

Absent any supporting data it's just a weird personal observation and comes off a bit creepy. I'm not saying the author is a creep, it's just a very peculiar way to make a point that could be made much less oddly. Do 1st graders need to have assess commented on and compared to 16 year olds (another group whose asses most of us do not observe with intention)? Why not just make a comment about weight generally?

Because body development is a science. Alterations to development patterns are sometimes linked to exposure to chemicals and such. For instance, back in the 90s some male kids grew breast tissues after exposure to then-common synthetic fragrances. It may be creepy, but someone has to notice these things as the proverbial canary in the coalmine.

> It may be creepy, but someone has to notice these things as the proverbial canary in the coalmine.

I do not disagree, but there is a way to notice it and comment on it that has far less probability of being considered "creepy" by someone reading. The author is of course free to do as they please, doesn't make their point any more right or wrong.

It’s horrid.

I think it's just selection bias for women with fat asses. Baby got back came out in 1992, and remained popular for quite sometime. It puts the people most influenced by it right around the age on having first graders. And of course it didn't stand alone, lots of music and popular culture focused much more heavily on ass at that point. Previously almost all focus had been on being skinny with "alert" breasts.

I think it's just being fatter, even as a youth.

Females store fat on ass and hips first, males on the gut first. Not only, but primarily first. Once these regions get to a point, fat accumulates all over.

Kids are indeed fatter in the West, just as adults are.