Peeing through diaper?

So my baby boy recently started rolling to his belly to sleep at night a few nights ago. The last two mornings when I have woken him up he has peed out of the front of his diaper and I'm not sure what to do to help. He wears size 2 during the day and they fit fine but I size up at night and put him in the baby dry to help a little bit more. We have never had issues with this in the past when he slept on his back, and we don't change his diaper through the night unless he poops. Anyone had this happen and have any tips? I don't want to be washing sheets everyday! 😝