Crazy or just being a baby

Lately Finn has taken on some odd behaviors while bouncing in his Jumperoo. He bounces a bit and then will lay his head to the right on his shoulder for a couple of seconds and then shake his head back and forth about 10 times. Then he will lay his head on the other shoulder and then shake his head again. Finally he lays his head straight back and then shakes it. He will go through this routine about 3 or 4 times throughout a jumperoo session. It is cute, funny, and a little disconcerting. Does anyone know if this is normal baby behavior?