What to do about fussy eating

My 17m son has recently starting being super fussy with his foods. He has always been a little fussy but there were always a few meals that he was guaranteed to eat. Now, the only thing he will eat is yoghurt, custard, Weetabix or most puree food in pouches.

I've tried offering him food and then blending it up and putting it into a reusable pouch for him but he won't have it, any puree I make he hate. What can I do? Is this normal? Should I give him pouches or just wait for an hour and offer the meal again?