All normal infants exhibit the moro and startle reflexes (sudden jerky movements of limbs on touch or sound) in the first 3 months. These reflexes may be exaggerated when there is cerebral irritability and if they persist in the presence of brain damage. Normal children and some adults when asleep may have sudden jerky movements resembling the startle reflex. Ill-sustained clonus is also seen in some normal newborns. Many newborn infants show a rapid jittery movement of the limbs. They occur particularly in the presence of hypocalcaemia (low serum calcium levels). It is very difficult to state whether the movements of limbs of your daughter are abnormal without observing them. I would have liked to do some blood tests like serum calcium and phosphate, blood sugar and complete blood counts before any treatment was started. The CT scan report is not confirmatory for brain atrophy. The normal development so far does not indicate brain damage.