Baby guinea fowl looks sick. can they catch colds?

[guinea fowl galore]

I know this is a stupid question but it has been raining here and yesterday the baby guinea fowl were outside in their pen and some got wet. I put a box in their pen with saw dust in it for them to snuggle up in and they were inside most of the time. but today the youngest is looking sick just standing there with his head tucked in and not careing if the other stomp all over him, He ate a little bit and is just sitting under the light, I added another light just in case one wasn't warm enough. I haven't seen him drink anything.
what should I be doing? is there something I can give him?

 

[Taylor]

I have hatched guineas numerous times. I haven't NEVER had one become sick, they would stay out in the rain all the time, they loved it!!! I really don't think guineas can get sick

 

[guinea fowl galore]

I just don't know what is wrong with him. he is not running around like he usually does and he has just been sleeping the whole day

I wish I knew.