How do I know when it's time to size up?

My son's 3 and a half months old and he keeps peeing through his size 1 diapers.

Ive even made sure his penis wasn't pointing in any certain direction so he would just pee out the side, which that has happened before.

But I've woken up 3 times this week in his pee.

Editing cause I'm to lazy to comment back.

But I figured it was time, I just wanted to double check. I have two boxes left of size ones so I was hoping it was just me putting the diaper on wrong cause I didnt want them wasted.

Oh well. He seems more comfortable in a 2.

Thanks for the Input everyone. 😊😊😊😊