@Yasmin he’s just gone up a size to 3-6 months but still having the issue 🥺
I found lidls nappies were really good with my first daughter she leaked in aldi and asda nappies x
I have the same issue with my 3 month old. I found doubling up his nappies at night helps
Have you tried sizing up the vest/ babygrow/ pyjamas? When we leaked we usually found it was because the nappy didn’t have room to expand x