Diaper size up?

Stacey

So we are still in size 4 diapers, no leaks during the day, and no leaks during the night. For the last week though it’s like she’s held her pee all night and when she wakes up and goes it soaks through the diaper. Would sizing up help or do we need an actual night time diaper for nights for that morning pee? I’m about to put her on the toilet when we first wake up 😂