Hi! We have eleven 5 week old sex-link chicks (5 barred rock/ rhode island red and 6 rhode island red/white). They all seem healthy and happy but one of the black ones is tiny. It is still almost as small as it was 3 weeks ago. Other than being tiny it's development seems to be going right along with the other chicks as far as we can tell. It isn't being picked on by the others and always gets enough food and water. Is there anything to worry about?