My 7 month baby tilts her head, (to both sides) once in a while! she sleeps on her side, is that the reason? how can be stopped?

Benign torticollas: There is a poorly understood process called benign paroxysmal torticollis of infancy that arises in late infancy.It is transient , recurrent & can be associated with agitation, pallor or vomiting. Some suspect a tie in with the process of vertigo in adults, but this resolves usually before 3. Head tilt can also reflect a problem with eye muscle balance but usually would only involve one side.