My 17 month has been selective since he started weaning but it got a lot worse from 14 months. We lose “safe foods” every month. I think a lot of things he now dislikes but used to love are due to texture issues as he looks digested at even touching some of them. Or if they’re mixed in with other things, he spits that bit out. E.g jacket potato with baked beans - he spits out the beans (which used to be a favourite). He does it with beans when served separately too as I think he likes the flavour but just sucks the sauce off. He at least still tries them currently but when this has happened with other foods, he eventually stops trying all together. He’s also got pretty bad neophobia right now too so new foods are a no-go (but still offered).
I don’t know what to do if you think your child has some sort of sensory processing issue with food though? He doesn’t currently have any weight issues so I don’t think any medical professional would care. Any advice?