I am going to get 3-5 chicks from our local farm store. They have a couple of the breeds that I want now. and will have the others in a couple weeks. Should I try as hard as possible to get them all the same age, or will a week or two make a big difference? The last batch of 4 I got were 4 weeks old and I noticed that one of them was definitely a couple weeks behind in growth and they all did ok together. These new ones will be day old, or close to it.