My son sometimes speaks with an American accent and is almost 6 and still not potty trained.
He is autistic.
We had him in nursery full time but it became quite clear that they were not meeting his needs, not able to even with adjustments and keeping him in there full time was tantamount to neglect.
I dropped my hours significantly at work. We were in the bathroom hours every single day trying to potty train. We had occupational therapy intervention, regular health visitor intervention, speech and language therapy more often than most children with autism and a significant speech delay.
He's a gestalt language processor and he was really interested in American cartoons and Peppa pig. Although we used gestalts at home and offered functional phrases he only really picked up on those from the TV or his tablet.
We would spend hours every day reading. I would read out loud even if he was doing solo play. We would read on a morning and before bed and we would look at the pictures and I'd talk about them.
The only foundation we had for building his language was American cartoons.
His speech has developed so much now but sometimes he sounds like Peppa, sometimes he sounds American and others he sounds like he's got a broad Yorkshire accent.
He got kept behind a year so he's doing reception twice. He is still in nappies and that's the advice we were given by ERIC as without the nappies he withholds.
He will use a toilet if one is available for a wee but he won't poo in a toilet and there's too many variables with bathrooms to make each and every one a sensory pleasant place to be.
I'm really lucky that my son got a diagnosis before starting school. I feel like it's saved us a lot of shame and parent blaming but like my son there are other children in his class who present similarly but haven't been fortunate enough to get a diagnosis so young.