yellow, foamy, slightly runny poo

[a123andpoof]

I have some chicks a few weeks old, I was holding one and she pooed and it was greenish/yellow color, slightly foamy and runny with a hint of white. They both have also had a slight sneeze, and I was thinking it could have just been a dusty brooder, but now not to sure. They seem healthy eating and drinking, playing and just acting like chicks. Any ideas?