Sounds to me like his knees/tendons are fine: The back of his knees would look totally flat if the tendons had slipped. It would be very noticeable....you would not be able to miss it. Imagine your finger knuckle smashed flat and that would be what it looked like.
The issue is more than likely some sort of nutritional one from what you are describing. He may be weak from malnutrition or vitamin deficiencies.
IF you can find some Save-a-Chick powder you may add that to his water (carry it at Tractor Supply). Their is also an infant vitamin you can buy...someone will know what it is. You may also give him some Pedialyte or the fake version mixed with his water.
If he doesn't seem to be fevered, you do not want to give him antibiotics.
Brewers yeast will be the best route to try immediately: Health food stores carry it. I don't know if WalMart or Walgreens would have it in their supplement section. You should be able to call and find out if they carry it. However, Celtic is very knowledgeable and may be close enough to offer aid.
You can post photos on here very easily. Press the button that looks like a little painting beside the film looking one. That will allow you to browse your hard drive for photos. It may take a bit to load if the file size is large, but it will load.
