Period bikini bottoms - tiny teen

[TomCat24]

Any recommendations for some period swimwear (just need bikini bottoms really) for a very small teenager (11-12 years size possibly!)

Also don’t want to spend the earth as they’re for ‘just in case’. Had a look on Amazon but always hard to tell the quality/effectiveness.

TIA

My daughter has Modibodi ones. She loves them. Can buy just bottoms. Sizing is small

We bought some cheap ones off of Amazon, she said she'd be comfortable to wear them under a bikini

The more I hear the more confused I get. I thought the point was that you didn’t need to have both?

My daughter just wears the period bikini, no other bottoms. She finds them so comfortable that she just wears them even when not on her period

I've heard good things about Primark and they go to a size 6, or sometimes even a 4 I think.