Peeing up back?

Whitney • Hi! First time mom to Desmond 💙! He was born at 35 weeks and 4 days on November 7th, 2015!
Ok, so this might seem dumb, but is it possible for a boy to pee up his back? Lol. I initially thought it was sweat on his back and maybe we were overheating him, but it comes suddenly and in huge quantities. I was holding him and then all of a sudden his back and my shirt were soaked through within seconds. He's premature and maybe I'm not making the diaper snug enough? Or is this something else.