It could be a phase Try the white rice and soup Else what I did was also to chop or grate everything up very finely and cook with the rice Adding stock as base for rice to cook Mine stuck with rice and soup for some months before changing. I have more veg and juices as well in forms of popsicle If still worried Try pediasure or acenda for awhile to make sure he is getting enough nutrients Maybe try make mealtime interesting or having meals together Normally they will be interested in what’s on my plate so I ended up “eating” what they are suppose to eat and that got their interest for awhile I also tried to decorate their meals slightly or change the menu about to include pasta, etc
Thanks for the advice. We were quite lost and felt bad that we do not know what he want to eat. We will try your suggestions and see whether it works.