This was common practice, back in the bad old days. Growing girls lined up, the coach with a clip board.

Back in the 1970s I recall boys at the gym getting a hold of the weight records binder, teasing the girls. … I was one of those boys.
But in 2011 it’s not recommended to weigh female gymnasts. A coach should keep tabs on the growth & weight of each athlete, but it should be done in a positive manner. Confidentially.
Talk about food as fuel.
Female gymnasts are often heavier than they look. Dense bones and a low fat/muscle ratio makes for a deceptive weight.
There’s a thread on this topic on Chalk Bucket.
Weigh in in the comments, if you have an opinion.
