Toilet seat for large toddler - does such a thing exist??

[newroundhere]

My 28 month old DS is just starting potty training but we're struggling as he is very big for his age (100cm tall and 20.3kg) and doesn't fit very well onto the potty or the child's toilet set we have that goes on top of the toilet which means that the few times we've actually got him to do a wee it's just gone everywhere

He's not secure enough to sit just on the normal toilet seat, has anyone found a child seat or potty that works for a larger toddler?

Hopeful bump...

We have the Ikea toilet seat. My 3.5 year old isn't small and she uses it and will do for a long while yet I'd imagine. It doesn't seem small at all.

We got a family seat and replaced the normal.loo seat with it. Like this one

www.amazon.co.uk/Vinsani-Soft-Close-Release-Friendly-Training/dp/B00545KF7O/ref=sr_1_2?keywords=the+family+toilet+seat&tag=mumsnetforum-21&ie=UTF8&qid=1543768451&sr=8-2

Thanks! I will have a look at both of those. In fact we might go to B&Q and see if they have any family seats on display so we can try. We're building up a collection of seats that are too small!