Swollen chest/breast on duckling??

[angierfind]

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Hi.
So I'm not sure what's going on but one of my ducklings has a larger breast (his/her right side) is this normal? Or is it a crop? It's literally so big that he/she looks bald sometimes!
I'm sorry I'm having new duck mommy syndrome! I'm literally worried about everything!

 

[seasprite]

So cute!! I don't see anything weird, but it's kind of hard to tell. When my two 'lings were littler their little crops would get shockingly full sometimes, so I'm guessing that's probably all it is. One of my older ducks stuffs herself until her crop looks like she is neck-pregnant sometimes - I think some ducks are just like that? (Especially if peas are involved!)