I found this solution while at a family reunion.
My aunt and uncle were trying to quiet their kid during the blessing, and he would not stay quiet. They tryed their hardest while trying to respect the prayer, but it was quite hard to even think. They got out all of his expensive toys and he shut up for a little while but, one again he started crying.
My grandma got quite pissed off, went to her car, and returned with a cardboard box, and gave it to the kid.
Silence.
After that, thats all i heard about: While expensive toys will make a child quiet for a little while, the cheapest and most inconceivable things will quiet a child even longer.