Chicks with foamy/ ligudy poop

[Rain the house chicken]

So I just hatched chicks a few days ago. They have been having foamy poops for about two days now. I didn't think it was in issue. Till wish almost got pasty butt. I lost my chick candy corn to it, she died in my hands. But any ways, I added some probiotics to the water. What does it mean when they have foamy poop. Is it bad? Please help, this is my first time dealing with something like this and I have had like thirty batches of birds. Sorry I can't get pictures of that right now.

 

[nuthatched]

It's just like gas, it's pretty normal.