E.E.
Hi H.!
My youngest had a lot of problems with bald spots, too. She was constantly looking around the room and every time she moved her head, she'd rub more hair off! It eventually grew back. When she got old enough, we put her on her tummy for playtime and that helped a lot. (That probably doesn't help much if she's really spitty, though) We also found if we put her in the walker with pillows around her, she stayed upright without rubbing her head on anything.
Good luck!