Jules - Eating habits at 10 months

Jules has been developing this habit of pushing and pulling his seat (in his seat!) while he eats. It's like he's jerking himself forward and backwards, then flapping his legs like he's running in the air...looks very cute but soo soo naughty!
My helper has such a hard time feeding this little fella. He turns his heads all the time and splutters while he eats despite hubs shouting a very stern NO at him. It works for awhile with him looking all dejected and quiet. But after one minute, he is back to his usual antics again.

aiyoh.