I’m not convinced it’s about UV cover - no one has a problem with little boys wearing speedos or shorts, as is very common. It never occurred to me that a bikini is sexual, it’s just a practical way to go swimming - much more convenient for going to the loo than a one-piece 🤷🏼♀️ I wear a bikini, and I’m not trying to be sexy, I’m just swimming. The ones I’ve seen for little girls are cute and age appropriate - not high cut or thongs or padded bras etc. If you think a swimming costume is more appropriate because it hides a little girls’ tummy for being ‘too sexy’, then you’ve lost me.