Help! Diaper leaks at night!

Kori

I have moved my son up to a size 2 pampers with no avail. He is 13-14 lbs and kicks a a lot at night. Bringing his legs up and slamming them down in his crib. This is causing urine leaks in the back, in his little love to dream sack. He’s 14 weeks. Any suggestions? I hate that he lays in a wet swaddle for the night until I find it in the morning.