Nolan's reactions are just too adorable. When first introduced with a spoon, a foreign object until now, he simple just does not know what do to with it. He seems confused and apprehensive. His parents decide that the best way to show would be through example, so they show him that this is for eating. Nolan, copying mommy, opens his mouth and voila!
I guess the sensation must be very different as he seems slightly confused of what to do with it once he has eaten it.