From personal experience with a mildly pasted chick:
She was barely pasted, but after 4 days she was smaller and weaker with the sickly chick look. I watched her and noticed she wasn't pooping. She had no pasting on her butt, but she was clogged internally. She has become constipated without any outward signs other than a slightly enlarged behind. To be graphic I put a finger on each side of her vent and applied slight pressure to help her poo. I did this every 15 minutes for 2 hours (popping her poop pimple) and then checked her hourly for the rest of the day. She recovered fully and earned her wonderful name Buttplugg.
Check for constipation.
She was barely pasted, but after 4 days she was smaller and weaker with the sickly chick look. I watched her and noticed she wasn't pooping. She had no pasting on her butt, but she was clogged internally. She has become constipated without any outward signs other than a slightly enlarged behind. To be graphic I put a finger on each side of her vent and applied slight pressure to help her poo. I did this every 15 minutes for 2 hours (popping her poop pimple) and then checked her hourly for the rest of the day. She recovered fully and earned her wonderful name Buttplugg.
Check for constipation.