Thank you, we do put the drake into a dog pen at night when we pen them up and have been keeping him in the enclosure we have for them during the day by himself. The baby and the three adult females go free during the day. About two weeks ago, the drake tackled the baby in the outer pen before we could get them out, not sure exactly how it happened; I wasn't there. My partner was letting them out. The male got right on top of the baby and tried to breed it, so my partner grabbed him by the neck and put him in the pen. The baby doesn't seem to be hurt, it runs all over the yard and it is almost as big as the other ones now.
We were thinking about letting the drake out with them all at the end of the month. Our train of thought is that there are 3 females and the baby would have lots of space to get away from him. One of the females has wanted back into the enclosure with the drake a few times so I just let her go in. I really don't want the baby to get hurt. I am surprised, though that he still just "peeps" for his size. He doesn't quack like the females which is why I think it is a male also.
What would you recommend we do if the drake just keeps being aggressive with the baby?