My 2yo has cerebral palsy and can't sit or crawl. We got a good amount of equipment for him.
But bath seats were deemed not daily equipment and we had to go to a charity and apply for funding. It was a long and complex process but we got there in the end.
On a related note the cost a disabled equipment is ridiculous! I understand it is specialist stuff but some of these things are like 500 quid for a seat with a few extra straps.
Feels like the way they mark up everything if you mention it's for a wedding.