It's my 3 month old daughter. she shakes her head left and right often and i was wondering if that is normal or if it is something i need to be worried about. ?

Follow up: This is probably a normal finding, but if you notice any eye rolling, arching or shaking of her limbs, a neurology referral can be made. If she is otherwise well and developing/growing normally, I would advise letting your PCP know at her next visit. Monitor her temperature to check for fever. If there are other symptoms, please see your PCP.