I have a little slw cockerel and 5 slw chicks. The cockerel is quite a bit smaller than the girls, is a bit of a whiner, and has runny poo. It looks like a puddle of rust. Otherwise he is very active, eats and drinks all the time, and does everything the girls do. Is it normal for him to be so small? Is the poo something to worry about? They are eating medicated starter (Purina), get fresh water twice a day, have a warm brooder that is cleaned twice a day, and get mealworms, oats, chick scratch, and chick grit for a treat once a day. They are almost two weeks old.