Diapers at Night

So this isn’t really a pregnancy question lol but my 1 year old keeps leaking out of his diaper. Only at night while he’s sleeping. It’s like every night now 🤦🏻‍♀️ I’m wondering if he needs a better brand or like night time pull ups? 🤷🏻‍♀️ or a bigger size. But I know he’s not ready for something bigger. His size 6 still have a little leeway. Any suggestions??

I do keep a mattress pad under him and under his sheet but that only helps so much.

Pic for attention lmao 😂