I have 2 one week old Plymouth Rocks and one of them seems to be growing much faster than the other- is this normal? The smaller one you can barely see the wing feathers where the older looking one has much longer wing feathers. Also the bigger one has a larger patch of white on it's head. Could one have actually hatched a few days earlier and it's just an age difference or is one possibly a roo? The smaller one seems to be perfectly healthy, although I was worried about her the first day and night as she seemed very lethargic and unsteady on her feet. Now she's actually the most lively one of the four I have ( I also have two RIR). Any guesses what's going on?