Welcome to tantrum central🙈 my LG has been doing this for a while now. She used to do it when she was done with her food and didn't want any more but now its just on a whim and shes fed up and wants to get out lol. Its just their way of pushing boundaries especially as they're now learning they can't always do what they want when they want! I saw this really good video on Insta about teaching them boundaries at meal times and stop the messy play! Will see if I can post the link here
https://www.instagram.com/reel/DEqUT8co9bs/?igsh=a3dxOXdrZ3dqeGFr
I have literally the same happening to my 11 month old, he actually stopped drinking his milk, drinks maybe one full bottle 7 oz a day the rest gets wasted. He is not eating well either and he has nappy rash on top of it all. He had 5 days course of antibiotics so I guess it’s the main reason for him beeing so fussy 😩