This sounds like the start of a really bad joke. I wish it was. This is the paradigm of "normal" that we need to be cautious of.
So a friend of mine takes her 1 year old son in for his check up with the pediatrician and the doc comments how the little guy is dropping in his percentile of weight. Not that he is undernourished, malnourished, showing any signs of starvation or abuse. He is just not as big "for his age group" as he used to be.
I know the family and mom feeds the kids typically very healthy. So what happened that he is dropping compared to his "peers"? I think the answer is easy - like my kids, they don't eat foods loaded with growth hormones, antibiotics, pesticides, herbicides, or other chemicals. Growth hormones in meat artificially stimulate our bodies to get bigger faster. Not healthier mind you, just bigger.
Shame on this pediatrician for not looking at anything other than an age-divided height/weight chart before making a comment that has the potential to really upset a good parent. What are we willing to accept as normal? Does being called small compared to a group of overweight people seem a bit off to you to?
A good doctor asks you about eating and exercise habits, vitamin/mineral supplements, how much water you drink, what kind of things you do to relieve stress, how much rest you get, etc. That is part of taking care of a whole person and being a trusted and learned friend a.k.a. doctor.