My buddy is hatching a bunch of eggs for me. They should start hatching this weekend. This is my first time with chickens. He said he will keep them for 3 weeks till they get there legs. He said when I get them home I will have to keep them in the coop for about a month. Does that sound right? and if so.. what is the reason. I only ask because I went through great lengths to make a secure outside run and was hoping the would get to use it from the start. Also... How long to I keep them on starter food before i can start mixing and change over to regular adult food?