"Growth" on baby chick

[Goingsolo 24]

My White Sussex chicks have hatched, but I noticed one has a "bubble/growth" on its rear end. What could like be? The chick only hatched today and is acting normal. PS: purple is for identification purposes.

 

[Chick-N-Fun]

That does not look like the yolk so I am going to reach out to someone who may know. @Pyxis @casportpony @Eggcessive

 

[chickens really]

I think that looks like a herniated umbilical..
@WVduckchick

 

[WVduckchick]

Looks like unabsorbed yolk to me. Keep that baby on a soft towel or something that it can’t rip it open. Hopefully it will absorb or dry up quickly.

 

[Goingsolo 24]

Thank you everyone. Unfortunately the chick did not make it. Anyone know what could have caused it?

 

[WVduckchick]

So sorry.
Looks like it hatched a little before it was ready.

 

[Goingsolo 24]

So sorry.
Looks like it hatched a little before it was ready.

All hatched on day 21 plus a few hours and are strong. I've hatched about 35 chicks (doing this on a small scale) in 4 months and not seen this before. Lots to learn still.