Chicks keep dying

[Osofarm11]

In less than 3 weeks I’ve lost 5 chicks and I have no clue what’s happening with them. Some of them are completely fine until they suddenly die or others have been acting lethargic until they share the same fate. They’re poops look normal but because they’re with a hen it’s hard to look for any. It seems to only affect chicks from a certain mother. Because I have another mom in the same area and her chicks are fine. I don’t know what to do? I don’t want to lose any more. They’re about 3weeks to a week old

 

[Osofarm11]

In less than 3 weeks I’ve lost 5 chicks and I have no clue what’s happening with them. Some of them are completely fine until they suddenly die or others have been acting lethargic until they share the same fate. They’re poops look normal but because they’re with a hen it’s hard to look for any. It seems to only affect chicks from a certain mother. Because I have another mom in the same area and her chicks are fine. I don’t know what to do? I don’t want to lose any more. They’re about 3weeks to a week old

Another two chicks were nonstop chirping until they died

 

[nuthatched]

I'm sorry to hear that.
What's your brooder set up? Type of heat and temperatures? Space? Type of brooder?
Poops butts?
Feed?

 

[Wyorp Rock]

In less than 3 weeks I’ve lost 5 chicks and I have no clue what’s happening with them. Some of them are completely fine until they suddenly die or others have been acting lethargic until they share the same fate. They’re poops look normal but because they’re with a hen it’s hard to look for any. It seems to only affect chicks from a certain mother.

They’re about 3weeks to a week old

Another two chicks were nonstop chirping until they died

I'm sorry for your losses.

Can you please post photos of the chicks, the poop and how they are kept?

Non stop chirping? Do you see them eating and drinking? Do they have full crops?
Any pasting of butts?

What are you feeding, including treats? I assume the other broody and chicks are eating the same type of feed with no issues?

Is Mama hen taking the chicks under her o.k. - she's not abandoning them or leaving them correct?

Have you treated for Coccidiosis?