Shaking head no?

Hi there!

Any advice or similar stories welcome!

My 8.5 month old recently started shaking his head no. He will do it for a few seconds, stop, then start again. He only does it a couple times but it kinda freaks me out. He usually does it when he’s getting tired so I’m thinking the two could be connected? I’m just not sure if this is something that is normal or if it’s something I should take him in for. Our next appointment is July 20th and I will definitely bring it up, but I’m not sure if it’s something to be seen for sooner.

He doesn’t have a fever, no signs of an ear infection, he is teething but no teeth yet.

Thanks in advance!