What Causes Muscle Spasm For My Infant?

MY 6 MONTH OLD INFANT SEEMED TO HAVE 4 SMALL SPASMS YESTERDAY. CONTRACTED LEFT HAND AND DREW ARM /SHOULDER UP TO EAR. DID NOT LOOSE CONSCIENCE, LAUGH, CRY, SMILE - LASTED MERE SECONDS. WAS WHILE FEEDING NEW VEGGIE. WENT TO PED AND HAD CBC ORDERED. INITIAL RESULTS CAME BACK FINE WITH EXCEPTION OF SLIGHTLY ELEVATED CPK LEVELS. INFANT HAS HIT ALL MILESTONES, IS INTERACTIVE, BABBLES, SITS, OFF THE CHARTS FOR HEIGHT, WEIGHT AT 87% AND HEAD AT 85%...HEAD HAS HAD A SURGE OF GROWTH - BEGAN IN 35%..NEURO CONSULT TOMORROW. QUITE WORRIED - ASSUMING EEG & CT SCAN....HOW ALARMED SHOULD I BE & WHAT QUESTIONS SHOULD I ASK NEURO? THANK YOU