Torahis1- great reply. That is absolutely true. However, it is sad that people check for size and do not care about the long term health of a girl. It is sad for the boy and for the girl, everyone suffers when the mother struggles more than she has to physically because she just didn’t know why a person with a delicate frame has to do some exercise and not just sit back and thank Hashem for making them pretty.
In general we need to teach kids about health, the real reason we care about size is because it is an indicator of health. People who are skinny, do tend to have less heart disease, etc. But if in school we learned about proper nutrition, had to do exercise and were taught about basic prevention, fewer girls would be overweight in the first place, everyone would be healthier and this issue would be minimized.