Weird question, sorry! Huge searchable history on here, I'm not a troll!
With ds it was easy - willy is freely used across the UK.
But I want dd 20 months to have a word to describe her vulva/vagina, for if she's hurt, needs a wee, has a uti etc. Right now she seems to think it's her bottom as I refer to changing her bottom/nappy. I don't want something ridiculous like flower, or something gross like minge or fanny. What's usual in your home/circles/region? She knows when she needs a 'wee wee' from copying her big brother. I could use that I suppose?