Differentiating between jitteriness and seizures are not always easy, but seeking a good history from the caregivers of the baby might give enough clue.
Jitteriness is shaking movement of both hands and both feet simultaneously. It occurs in response to some sudden onset stimulus like movement of body or noise, unlike seizures.
Jitteriness stops when a limb of the baby is touched. Whereas seizures don’t stop on touching the limbs of the baby.
It’s important to differentiate between jitteriness and seizures because the treatment is different for these two conditions. Jitteriness generally don’t need any further work up, but seizures will require further detailed work up to find the underlying cause and provide treatment.