Baby jiggles alot in my bellly?😳

Im 29 weeks pregnant and my son has been jiggling my belly alot lately.. like i know its kicks but my stomach jiggles like an earthquake and shakes😳is this normal activity what babies do ? This is my first time being a mom so i have no idea what to expect. It almost feels like”god forbid” hes having a seizure or something 😳i know i shouldnt think the worst. But he does kick me like normally but sometimes when he kicks or makes movement , it feels jiggly and earthquakish like..