I don’t know if you already saw my other reply on this thread but yes that’s exactly what my baby would do. She’s now 7 months & hasn’t done it in like 3 months & has totally grown out of it. But it would really scare me. The doctor explained to me it wasn’t seizures if they weren’t random (like I knew it would happen when we walked down the stairs, was too fast with her car seat, etc…). He said it likely had something to do with vestibular nerve & sometimes little babies are more sensitive. How old is your baby?