IKEA might have what you want - AND teach the boys to stand and pee - they should hold the back of the seat when they lift it up - klind of push against it - this gets them facing the right way (vs looking around behind them - then they spray everywhere!). DO NOT say they "need to hold up the seat so it doesn't fall" - that will scare them unnecessarily - but just lean on the seat when it's up" gets them facing and pointing down.

Hi! Can someone point me to the models that are sized for toddler sized toilet? Not the one that fits adult one, but for those small toddler-sized toilets? Ideally with the splash guard
We have quite few boys who are little bit messy (not their fault) and can't aim because of their anatomy. And some of the liquid goes on sit and floor. All seat inserts with guard that I found are meant to be used with regular-sized toilets.