a baby waterfowl, such as a duck imprints on a species. They bond to an individual.
As long as a duckling sees a human first, you won't have an imprinting problem. It doesn't matter which human.
We got our baby ducks day old after their cross country travels form Cali to Alabama. My fiance and I each took one baby and spent time with it. I lheld mine all the time. You can also try approching your babies with your hand in a particular postion. With your fingers together, put your thumb to them, almost making the shape of a duck head. I find the babies aren't as scared of your approaching hand if you do this. I have baby diaper harnesses for them which keeps them from pooping on everything while holding them. I'd Diaper vinny and let him run around my bed or couch withme. He usually would run up my torso and climb on my shoulder, hop on my head and hide in my hair. He really liked being by my face too.
Asa funny side story, my duck Victor came from Metzer farms, in California... which is close to mexico. They probably employ hispanic people at their hatchery. Why do i think this? Well i think they played spanish music in the hatchery because everytime a spanish song comes on, he perks up and gets excited.