Infant no longer wants textured food

So my 9 month old recovered from a week of high fever (was hospitalised).. His appetite went from willing to try and eat every texture (prior to being sick) to spitting everything out. We started with puree at 6 months old and eventually did BLW.. but now.. all he wants is milk and worse, sometimes he doesn't even want any food I cooked (can even be porridge which doesnt even require chewing). Im very worried actually. Any mothers and their bubs went through the same? If yes.. how do I overcome this?