Also if they are moving a lot at night I find the nappy pants so much better for overnight
Second the vest thing, I was trying to get my moneys worth out of the 6-9months vests 😅 but they were getting too short for him and causing his nappy to leak
We use pampers nappies and they're great for night time, it could be you need to size up but before that check that the vest isn't too tight as that can cause leakage too.