Ok. Right now I have a 6 week old, a 2 weekold (almost) and 5 4 day old Pekin ducklings. I know that I can't put the younger ones with the 6 week old yet because of the size, but when I introduced the 2 week old to the 4 day old, he got pushy. At first he was afraid of them and jumped up on my legs, but when they started playing, he suddenly jumped down and started pushing them with his chest. He only used his mouth a couple of times. Should I just keep putting them together every day so they learn to get along? I do NOT leave them alone at any point. I should mention that the 2 week old is in with chicks right now. Our 6 week old is also in the same room but she is actually in our bath tub or on her "deck". She doesn't seem to care 1 way or another. Although at 1 point I thought she was going to jump down. that's when I put the babies back because by myself, I would not have been able to handle all of them at once if a fight should break out. Anyway, again, should I just keep putting them younger ones together and see if they get along? I thought about putting the 2 week in with same container as the 4 day olds but I didnt want to take a chance. There is not much size differance. They're all gonna have to live "happily ever after" together when they get older.