How do you determine it for a TODDLER????
I mean other than the blatantly obvious 2 year old that weighs 80 lbs....
I mean kids tend to have a lot of fat anyway at these ages, and a pudgy toddler does not equate to a fat child or adult.
My nephew was an insane chunk as a toddler, now at 10 He's lucky if he weighs 60lbs sopping wet.
I don't see how you can use standardized BMI in this age range in any meaningful way... other than the morbidly obese. Kids at this age must consume fat, and large amounts to help their brains and other areas develop properly.. IE Whole Fat Milk up until 2 years old, etc etc etc..
The rules change once they are past this stage, but as toddlers/infants, I don't see how you can effectively set meaningful standards in all but the most extreme cases.
they need government funding to extend their research. you think they care about children?