Questions for those with experience with IS

I understand it can present differently in different children, but just trying to educate myself so I can know what to look for. My daughter is only 11 weeks. Last night she had her typical Moro reflex (arms out, knees in) several times over the course of a few minutes. Her torso/neck/face/eyes all seemed normal. I called the on-call pediatrician and she said baby was maybe just feeling unsteady since I had her on my knees.

I recorded her this morning and am wondering if I’m being paranoid or if I should be concerned. Since she’s so young I know this could all be normal. She does have reflux and she has hiccups in this video, which typically seem to make her startle reflex worse. Thanks in advance for any insight!