If that is a Purina Label - the date would be March 5, 2019 when it was milled/bagged.
It should be o.k. - does it smell o.k.?
Are they avoiding the heat at all? I would watch to see if they are overheating.
See that everyone is eating/drinking well.
Chicks can have an overload of...
I'm sorry for your loss :hugs
Can you post some photos of your brooder set-up, the chicks and their poop?
What is the temperature in your brooder? Only one spot that's warm right, the rest of the brooder is cool?
What are you feeding, including any treats?
Where did the chicks come from?
At 5...
Is the chick able to poop?
It sounds like it may have a little bit of prolapse. Could be constipated?
Try to get a picture if you can.
You can try soaking the vent in a little cup of warm espsom salts water to help soothe the area. Dry well and keep your chick warm. Apply your ointment...