My 4.5month DS is wearing size 4 nappies. Quite often he’s getting leaks through the night. Size 3s were leaking terrible and I realised we needed to size up, but still had a few leaks in the size 4. He’s big round the tummy and chunky on the thighs. I’ve checked that I’m putting them on correctly, as I definitely haven’t done on some sleep deprived nights! He mostly leaks at the top of the legs at the front. Just wondering about trying pull up pants at night, does anyone think these might leak less?