Okay, I may be annoying some here, but so be it.
I think the royal children are now so old that yawning the jaws 180 degrees and picking their noses at events is a major no, no!
It's simply bad manners and they ought to have been taught from early age that that simply is not acceptable. - It's not acceptable for ordinary children that age as well.
Until they are four-five it's cute, but that's when it has to end and children aged six and up are old enough to understand.
The occasional slip happens, but this is not the first time.
So IMO this is something Haakon and Mette-Marit should crack down on, - hard!