I'm inclined to say it is a Least Sandpiper, which is the smallest of the shorebirds (and only slightly larger than a Chickadee). I almost said Baird's, however they have dark gray legs, and are slightly larger...and have maybe a slightly longer bill.
Actually, you did say Baird's, before the edit.
But I'm inclined to agree that it's a least sandpiper.
I took a closer look at the legs, which looked gray at first. Given that they are yellow, definitely not Baird's. And it was "almost"...I did edit.