You have beautiful babies and these came from ideal hatchery as assorted ducksYes, looks like my Cayuga babies. They sometimes have a little light yellow or gray color on their chests as ducklings. It could also be a Cayuga cross since it does look to be pretty bright yellow there. Here's one of my Cayuga ducklings: And here are some of my Cayuga/Rouen crosses: They can look pretty similar, but you'll see different markings show up as they get in their adult feathers if it is a cross. The yellow area will fade as it gets older and black feathers will eventually come in there if it's a pure Cayuga. If it's a cross it will have white feathers come in there instead of black.