I advocate when my kids need advocacy. For my own sake, I wish they'd take turns a little better than they do.
We put my older onto an IEP on the same day we skipped a grade for my younger. These were done in two successive building team meetings, lasting a total of 4 hours. Afterwards, the principal pushed himself back from the table looking overwhelmed and asked, "you don't have any more kids, do you?"
I've not seen resistance to dealing with different kids needs at more or less at the same time when the requests are based on concrete evidence or observations.