We have a 29 week old (almost 7 months) light Brahma purchase as a day-old along with three other light Brahmas and 16 other assorted pullets. This one is the largest of the flock, but has the palest cowl and nearly no comb or wattle. The rest of the flock, including the other Brahmas have much more advanced comb and wattle development. We also have not observed her displaying any laying behaviors. Should we be concerned?