Chick died and I don't know why - Another having similar symptoms.. Help!!!

[Moochie]

I hatched 3 japanese bantam chicks out of 6 eggs.. 1 died and I have no idea why. It was perfectly fine and healthy until 2 days ago. It started cheeping non-stop, very loudly, wouldn't eat, it would drink water, poop was white, yesterday I found it very weak, could barely lift it's head, it was sleeping a lot, and at 4 A.M. I found it dead. Now another chick is cheeping loudly non-stop like the other one was, I don't know what killed my chick but I really hope it's not contagious. I changed bedding, disinfected/cleaned the brooder, and disinfected/cleaned food feeder and waterer.
This is very disappointing for me.. I only have a Japanese bantam pair and I am trying to get more pullets or hens. I really like the breed because of their looks and personality, a dead chick doesn't look like a good sign to me.

 

[sumi]

What is their brooder temperature?
Are you feeding medicated or non-medicated chick food?

 

[Moochie]

What is their brooder temperature?
Are you feeding medicated or non-medicated chick food?

Hello there sumi..
It's 90-95 right now, outside of the brooder where the food and water is it's a little lower. I believe the feed is medicated. I hope that's not bad...

 

[sumi]

Medicated feed helps prevent coccidiosis which is a big chick killer. The feed won't harm the chicks though. There is a few possible causes of chick deaths, I think have a look here:

https://www.backyardchickens.com/t/39604/some-causes-of-early-chick-mortality

See if anything there "clicks". Hope you can get to the bottom of this!

 

[Moochie]

Pullorum kind of sounds like it..
The other chick died on Thursday. Only one left but she's very healthy.