Aw, I'd really encourage you to check with your pediatrician about this one, mama, involuntary nodding ay better safe than sorry, lalo na at 8 months pa lang si baby. A few of us moms have had concerns like this before, at ang doctors talaga ang best person to assess kung normal developmental thing lang or kailangan ng follow-up. Don't worry, most likely okay lang, but best to get it checked para sa peace of mind mo!