Injured chick

[Marmalade Hens]

Hope it doesn't happen again. :/

 

[MargaretYakoda]

Sorry for your loss. It sounds to me as if your chick had an open navel.
One cause of an open navel is an incubator that's just a bit too hot.
I have had some problem hatches, with a few open navels. I lost the first chick because I had no idea what I was looking at.
The other two I put Blue-Kote on and wrapped in vetwrap. I wrote about it in this thread: https://www.backyardchickens.com/t/...after-48-hours-heres-what-i-did#post_13819144