Do they make infant-sized rain ponchos?

I'm on the floor, Jakob is next to me in his Bumbo seat.

And he is covered in spit-up.

As soon as I've mopped him up, more comes.

I need a rain poncho for him. And a moat around the Bumbo to act as drainage channel.

Seriously, the kid is like an active volcano. He's so soggy I don't even want to touch him! Jen suggested parking him in the bathtub for the day, and it might just come to that...