If they are getting "pasty butt" cleaning off their bottoms is recommended.
Here's some tips on managing it from: http://urbanfarmingandchickenconsultant.wordpress.com/tag/pasty-butt/
Pasty Butt (Blocked Vent)
A blocked vent is sometimes due to temperature fluctuations suffered by young chicks or more fragile breeds and can be due to stress. There may be other causes, as well. With young chicks, check the temperature in your brooder to ensure it is not fluctuating significantly.
A blocked vent is fatal if not taken care of quickly. A chick suffering pasty butt must be checked on throughout the day and will probably need treatment several times a day for several days.
Treatment:
Clean use a damp rag to remove poo from vent. If the poo is hard, you can soak the chicks bottom in a dish of warm water or put the chicks bottom under warm running water to help remove it.
Dry thoroughly dry the chick. Leaving a chick wet can reduce its immunity and leave it vulnerable to illness or infection.
Olive Oil once the chick is dry, use a Q-tip to gently apply olive oil around the vent to help prevent poos from sticking too hard.
Apple Cider Vinegar several BYCers add a drop or two of apple cider vinegar to drinking water to prevent or reduce the severity of pasty butt. (one tablespoon per gallon)
Here's some tips on managing it from: http://urbanfarmingandchickenconsultant.wordpress.com/tag/pasty-butt/
Pasty Butt (Blocked Vent)
A blocked vent is sometimes due to temperature fluctuations suffered by young chicks or more fragile breeds and can be due to stress. There may be other causes, as well. With young chicks, check the temperature in your brooder to ensure it is not fluctuating significantly.
A blocked vent is fatal if not taken care of quickly. A chick suffering pasty butt must be checked on throughout the day and will probably need treatment several times a day for several days.
Treatment:
Clean use a damp rag to remove poo from vent. If the poo is hard, you can soak the chicks bottom in a dish of warm water or put the chicks bottom under warm running water to help remove it.
Dry thoroughly dry the chick. Leaving a chick wet can reduce its immunity and leave it vulnerable to illness or infection.
Olive Oil once the chick is dry, use a Q-tip to gently apply olive oil around the vent to help prevent poos from sticking too hard.
Apple Cider Vinegar several BYCers add a drop or two of apple cider vinegar to drinking water to prevent or reduce the severity of pasty butt. (one tablespoon per gallon)