So I have a baby chick that is nearly a month old. Just a day ago it looked very tired, and it occasionally falls asleep while standing. Its belly is massive, and it just seems like it's having digestion problems, or constipation. I also checked for pasty but her vent is clean, yet it's constantly raising its leg; and you can see it's trying very hard to poop, but nothing is coming out. What's wrong? What should I do?