I think it's wonderful that you're getting a friend for your single duckling. That's the kindest thing to do. Ducks want other ducks for companions, but that doesn't mean that they can't make wonderful pets. I'm so happy my ducks have each other. If I was their only source of emotional support it would be a lot of pressure and so unfair to the the duck. They need constant company. Your ducklings at first might need supervision as you accustom the first one to the baby, but I bet they'll adjust quickly and be happy. I raised 6 ducklings and I'm glad they are bonded to each other. They are happy when they're out of my sight! But they trust me and feel comfortable with me because I spend so much time with them. And give them lots of treats - that's key. I respect their boundaries - some of them are okay being touched and some don't like it as much. These animals aren't like cats and dogs and it's important to understand that and not demand more than they can give us. I appreciate my ducks for the unique charm they have!