how to sex ducklings

[hollys chicks]

hi i was wondering how to sex mascovy ducklings, i bought 2 of them at the show and i dont know what sex they are, im thinking i have a drake and a hen one is smaller than the other and carries itself differently than the other
please help
if needed i will put photos up

 

[chixie]

I don't know if this is true but someone told me the feet on a male is bigger than the feet of a female

 

[Angie Poo]

I was told that young males have thicker legs then females.

Sorry I'm not much help.