I have three hens that are about seven months and just started laying eggs a month or two ago. I got new chicks that are now three months old. I have them in a small coop outside so the older chickens (that free range) can see them, they have been in their coop for a few weeks now. I want to introduce the two flocks, but I don't know how or when to. Also, one of the older chickens tries to peck at the babies through the chicken wire around their coop. I'm concerned that she will be aggressive when I introduce the flocks. What should I do?