What does it mean when my baby turns her head from side to side really quickly every time she rouses from her sleep? She's been doing this since birth and no, it's not because she's hungry and looking to latch. Could it be that her neck is itchy or she's feeling warm and trying to cool down?

She's 4 months but has been turning her head since birth. The movement she makes is rapid turning from left to right and usually lasts for on average 5 seconds. This happens only when she's rousing from her sleep either because of a sudden loud noise or when she wakes up on her own. The skin on her neck tended to get quite red earlier on but the redness is gone now. I'm asking because if it's an issue with the skin around her neck then we'll probably need to have that looked at.