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Elimination Communication

Refusing to sit on potty

I have been putting my now almost 17 month old on the potty and doing EC since he was about 8 months old. By the time he was 11 months, he was doing 95% of poos on his potty and we had a great routine going. Shortly after, I went back to work and he started going to a childminder and he's regressed further and further since. We're now at a point where he's refusing to sit on the potty and will only poo in his nappy. He's a NIGHTMARE to try and clean up after he's pooed in his nappy as hates being held still and it causes so much stress for both of us. I'm honestly at my wits end with it. The odd occasion we still do manage to get a poo on the potty or toilet, it's a such a relief.
We used to sit him on the potty and play and make it really fun. He was always happy with this until a month or two ago, when he started just running away and refusing to sit. I bought a toilet seat instead and he happily sits on there and plays etc, but won't poo on there. He did occasionally go to his potty on his own and sit on it for a few seconds and have the tiniest wee (and once a poo), but the last few days is even refusing to do that and won't even go anywhere near it.
Does anyone have any tips for encouraging him to use the potty again?
(Please don't suggest books as he hates being read to)