One of my leghorns had pasty butt and I cleared it up but I just saw her try and poop and it made that squirty noise but nothing came out. I re-checked her and nothing is in the way and her vent looks normal. She's running around and eating and drinking, just no poops! Can chicks fart or is she backed up from the inside? I've had them on regular water and organic starter feed. She's 3 days old. I'm such a nervous parent!