Our baby chicks are doing fantastic, eating, drinking and growing great. I'm not sure at what size or age to move the babies to the big pen. They are running out of space in the little pens we have them in but we are not sure if they are ready to be out from under the heat lamp or not. I would say half of the babies are about 3 weeks and the other is about 2weeks old. We also have 3ducks one is about 2-3 weeks and the other 2 are about 1-2 weeks old. I'm not quite sure of exact age. Will they be ok in the medium sized pen by themselves or should we keep them under the heat lamp longer? Any advice is appreciated. thanks in advance! We Included pictures to show their size and the pen they would be put in if it was ok to move them to a bigger pen.