DS is 18 months and for the last few weeks every single night his nappy isn't doing it's job. He wakes up soaked, his body, his clothes, his sleep sack and all the way to his mattress. I've tried every make I can get my hands on (not in UK so fairly limited). I've gone up to size 5 and then size 6. But none of it makes a difference.
Is there anything I can do other than getting extra bedding and a tumble dryer?