Overnight heavy wetter?

Robin

My baby is almost 4 months. She is soaking through her double stuffed diaper. We use a bamboo charcoal liner (with fleece) and we use two of them. She is leaking by morning. Some days more than others, but at least some every morning.

I don't really want to have to change her diaper in the middle of the night because she sleeps well and I don't wand to disturb it...

Advice for a more absorbent night diaper?