Since 10m old my little one started throwing her head back as if to look at the lights or ceiling. She's continued to do it for a few months now but it's more often. It's not necessarily linked to excitement or frustration but she does seem to be quite sensory seeking so I'm not sure if it's part of that? She hit all her milestones early and obviously she's too young to be diagnosed with anything but I don't know if it is a cause for worry or if this is just a stage that they go through?