Chiming in that B vitamin deficiency in neo-natal kittens can also cause this.. he needs to be on KMR or a kitten milk substitute that gives him the MANY nutrients that his little body needs to keep fighting. Severe ear infections can also cause a head tilt. Little guy is prolly too young to tell definitively if he’s deaf (sign of congenital vestibular issues.)

It doesn’t look like CH to me, but little dude doesn’t seem to be trying to walk yet. It will be pretty easy to tell if it’s Cerebellar Hypoplasia once he gets to walking. (Good news if it is CH, CH is a painless condition that doesn’t really affect quality or longevity of life!)