Very trivial but I haven’t taken DS swimming for months, we’re going in the morning and I don’t know what size swim nappy I should buy?! He’s 17 months, looks about the same height and weight as all other babies his age and wears size 5 regular nappies but could still fit in size 4. Do you size down for swim nappies? Huggies only do 3-4 or 5-6, 4-5 would be ideal! Can only afford one pack because I’m STILL waiting for bloody payday