Kids Kit toilet trainer with a step and a universal toilet trainer
This trainer is very sturdy. It can also be easily folded away and stored up against a shower screen or other rail so it is out of the way. See https://www.smartbubs.com.au/kids-seat-toilet-trainer.html for more details. Very useful for my boys. We also have a universal toilet trainer thrown in for toddlers who no longer want or need the step. We found it handy to have a spare.