Popping feeling

Maddy

I am currently 35 weeks pregnant with a boy and he's extremely active all the time. I've noticed since I've been about 30 weeks that when he's moving around sometimes I'll feel sort of a pop in my stomach.. is this normal? It's not often it's just every once in a while but I've been feeling it more than usual. It almost feels like maybe his bones are popping on the inside but I have no idea what could cause this