New ducklings- breed identification?

[Cc4]

Hey there!
I got four baby ducks today.
wondering if you all can help me identify them!
also, when and how can I tell their sex?

thanks so much!!

 

[muddy75]

The black one looks like a Cayuga
@shawluvsbirds @WVduckchick may be able to help with the others.

 

[cheezenkwackers]

The gray and yellow look like blue Swedish. The yellow duckling could be a white Crested.

 

[WVduckchick]

I think the yellow is a crested pekin, the blues are probably blue Swedish, and the black is either black Swedish, if it has a bib, or Cayuga if no bib. I can’t really see it’s chest. Kinda looks like it has a bib.
Adorable ducklings. Enjoy!

 

[HeatherKellyB]

Oh my! Crests are my weakness! So adorable! They're all so adorable Enjoy your precious ducklings