2 week old chicks wheezing and sneezing

[Cara83]

I have 5 two week old chicks I got from a hatchery and breeder.
One is sneezing and I can here her wheezing when I hold her close to my ear.
The brooder is well ventilated during the day and I cover them of a night.
I have put then outside three times in the past week for a short period of time when it's been a warm sunny day.
I do have some antibiotics but not sure If I should treat them all as I can separate her.

 

[nuthatched]

Did the breeder npip certification?

 

[Cara83]

Did the breeder npip certification?

What I don't even know what that means

 

[nuthatched]

What I don't even know what that means

It means the breeder makes sure their flock is free of disease.
What is their diet? What is in their bedding?