Why is my son doing this

Cassie • 🎉🎃🍁🍂 blessed with a beautiful 3 year old boy a 2 year girl and a 9 week girl👨‍👩‍👧‍👦
Ok so my son is not a picky eater will eat just about anything, but lately he won't ear anything I put infront of him, but he'd rather eat everything I have, he picks his food until it's a mess everywhere and then will come to me to eat half or all my dinner :/ is there anyone else's one year old doing this