Interesting! Chick hatched outside egg

[Kessel23]

Oh yeah, the yolks position and shape and color changed a few times in the first few days pictures, they definitely did not get it in one go. Imagine trying to do this with shipped eggs, you would never see a chick lol.

 

[Amer]

Whats the purposes of the disinfectant at the bottom of the cup and the calcium lactate?

The embryo absorbs calcium from the egg.