"who cares"
The person who made this thread. At least it isn't an annoying sock puppet thread.
I assume it is the producers, director, etc. that make these decisions. In terms of stage time, for opening night, I have a feeling winston is correct and the child who appears opening night is the one who would normally appear on that night. With cast recordings, I know they have done rotations with the children on the songs. For La Boheme, they did this with each of the three performing couples (who weren't children, but still, semi-related).
"We like to snark around here. Sometimes we actually talk about theater...but we try not to let that get in our way." - dramamama611