Help me sex my ducks

[hopsandbabs]

My two ducks a pekin and an Indian runner have gotten quite big quite fast. These are my first ducks, and though I've researched how to sex them, I still can't really tell. I feel like the pekin (Hops) is a male because I see some new feathers coming in, but Hops is not very loud or noisy. My Indian runner on the other hand (Babs) never stops making noise and I see no feathers that look curly.

Here's some photos

 

[Duck Drover]

If it quacks like a duck then it is a duck (hen) but if it sounds like a croaking frog it is a drake.