I had C cups by third grade, and my period when I was 8. I wasn't even fat, I just went through puberty super fucking early (I was like a shorter version of myself now, but 8). I can't imagine someone doing that to their child essentially on purpose. Life was fucked for a while, essentially till high school, cause all the boys and a lot of girls would seriously make fun of/pick on me for my tits and actual body. I got groped a lot and the reputation of slut followed me around because I was developed, regardless of being 10.  Yeah, don't make your kids fat. It's fucked up, for a lot of reasons.