Aww lol she's probably startling, they develop the startle reflex pretty early on and they flail and shake their little arms and legs.
My little girl does it too and i wonder the same thing it feels like shes having a seizure too
My noodle does that too! Lol it feels like a big fish flopping from side to side.im curious so BUMP!
Im 18w and everytime I eat something sweet my lil man goes crazy flips kicks all that. It feels so weird I just gotta hold my belly.